diff --git a/COLLABORATOR_GUIDE.md b/COLLABORATOR_GUIDE.md
index 4ce11257b707f2..6577ccf125a195 100644
--- a/COLLABORATOR_GUIDE.md
+++ b/COLLABORATOR_GUIDE.md
@@ -567,3 +567,19 @@ When the LTS working group determines that a new LTS release is required,
 selected commits will be picked from the staging branch to be included in the
 release. This process of making a release will be a collaboration between the
 LTS working group and the Release team.
+
+## Licensing and Copyright Headers
+
+All `*.js`, `*.cc\, and `*.h` files located in the `/lib' and `/src` folders
+*must* have an appropriate copyright statement and SPDX license identifier
+*only if it does not already have an existing copyright statement and license
+identifier.*
+
+```js
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+```
+
+Existing copyright statements and license identifiers within any source file
+*must not be modified or removed* without review and sign-off by both the
+Node.js Technical Steering Committee (TSC) and Node.js Foundation Board.
diff --git a/lib/.eslintrc.yaml b/lib/.eslintrc.yaml
index d8e34f85b5759d..5d6b58e3217319 100644
--- a/lib/.eslintrc.yaml
+++ b/lib/.eslintrc.yaml
@@ -3,3 +3,4 @@ rules:
   require-buffer: 2
   buffer-constructor: 2
   no-let-in-for-declaration: 2
+  no-copyright: 2
diff --git a/lib/_debug_agent.js b/lib/_debug_agent.js
index eedca7ef5843bb..deb210391e6eb1 100644
--- a/lib/_debug_agent.js
+++ b/lib/_debug_agent.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const assert = require('assert');
diff --git a/lib/_debugger.js b/lib/_debugger.js
index d3bf1f9ffa2dab..2e0e283c8b2791 100644
--- a/lib/_debugger.js
+++ b/lib/_debugger.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const internalUtil = require('internal/util');
diff --git a/lib/_http_agent.js b/lib/_http_agent.js
index eebdb242463b5d..52c3b52ec50c3f 100644
--- a/lib/_http_agent.js
+++ b/lib/_http_agent.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const net = require('net');
diff --git a/lib/_http_client.js b/lib/_http_client.js
index e8285fe81012c7..7b3bc0579a2b21 100644
--- a/lib/_http_client.js
+++ b/lib/_http_client.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const util = require('util');
diff --git a/lib/_http_common.js b/lib/_http_common.js
index b8724f00ec6557..237de09f035806 100644
--- a/lib/_http_common.js
+++ b/lib/_http_common.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const binding = process.binding('http_parser');
diff --git a/lib/_http_incoming.js b/lib/_http_incoming.js
index 53419323f46b0d..c8b0645d6755c9 100644
--- a/lib/_http_incoming.js
+++ b/lib/_http_incoming.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const util = require('util');
diff --git a/lib/_http_outgoing.js b/lib/_http_outgoing.js
index f9df7817512519..d66be3d886d4e4 100644
--- a/lib/_http_outgoing.js
+++ b/lib/_http_outgoing.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const assert = require('assert').ok;
diff --git a/lib/_http_server.js b/lib/_http_server.js
index 80880be46bb9e5..6b732d268ae20d 100644
--- a/lib/_http_server.js
+++ b/lib/_http_server.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const util = require('util');
diff --git a/lib/_linklist.js b/lib/_linklist.js
index 1d2e9fa4d4411a..d3bd0f54df4085 100644
--- a/lib/_linklist.js
+++ b/lib/_linklist.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 module.exports = require('internal/linkedlist');
diff --git a/lib/_stream_duplex.js b/lib/_stream_duplex.js
index bf498f623c743d..7905146bf302e9 100644
--- a/lib/_stream_duplex.js
+++ b/lib/_stream_duplex.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 // a duplex stream is just a stream that is both readable and writable.
 // Since JS doesn't have multiple prototypal inheritance, this class
 // prototypally inherits from Readable, and then parasitically from
diff --git a/lib/_stream_passthrough.js b/lib/_stream_passthrough.js
index 30952d436e3d38..bb35f31c8b8dc7 100644
--- a/lib/_stream_passthrough.js
+++ b/lib/_stream_passthrough.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 // a passthrough stream.
 // basically just the most minimal sort of Transform stream.
 // Every written chunk gets output as-is.
diff --git a/lib/_stream_readable.js b/lib/_stream_readable.js
index d6af8589f3bc85..2729c3543bf3ce 100644
--- a/lib/_stream_readable.js
+++ b/lib/_stream_readable.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 module.exports = Readable;
diff --git a/lib/_stream_transform.js b/lib/_stream_transform.js
index 892c80459a3649..6e8968db575141 100644
--- a/lib/_stream_transform.js
+++ b/lib/_stream_transform.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 // a transform stream is a readable/writable stream where you do
 // something with the data.  Sometimes it's called a "filter",
 // but that's not a great name for it, since that implies a thing where
diff --git a/lib/_stream_wrap.js b/lib/_stream_wrap.js
index fbc32965980e96..2f6050956087f8 100644
--- a/lib/_stream_wrap.js
+++ b/lib/_stream_wrap.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const assert = require('assert');
diff --git a/lib/_stream_writable.js b/lib/_stream_writable.js
index eedeb56e125db0..28e072913f1ade 100644
--- a/lib/_stream_writable.js
+++ b/lib/_stream_writable.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 // A bit simpler than readable streams.
 // Implement an async ._write(chunk, encoding, cb), and it'll handle all
 // the drain event emission and buffering.
diff --git a/lib/_tls_common.js b/lib/_tls_common.js
index 107c3bb2ea7c67..539985fcc36a4d 100644
--- a/lib/_tls_common.js
+++ b/lib/_tls_common.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const internalUtil = require('internal/util');
diff --git a/lib/_tls_legacy.js b/lib/_tls_legacy.js
index 83ee3e0f8f5cda..1712ffba55a68d 100644
--- a/lib/_tls_legacy.js
+++ b/lib/_tls_legacy.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 require('internal/util').assertCrypto();
diff --git a/lib/_tls_wrap.js b/lib/_tls_wrap.js
index 721cdde142519c..b3d0ce234a1c59 100644
--- a/lib/_tls_wrap.js
+++ b/lib/_tls_wrap.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 require('internal/util').assertCrypto();
diff --git a/lib/assert.js b/lib/assert.js
index 7f69ba0c60e476..7f8614b491003d 100644
--- a/lib/assert.js
+++ b/lib/assert.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 // http://wiki.commonjs.org/wiki/Unit_Testing/1.0
 //
 // THIS IS NOT TESTED NOR LIKELY TO WORK OUTSIDE V8!
diff --git a/lib/buffer.js b/lib/buffer.js
index cb93d7e2488f3b..f85594393ad479 100644
--- a/lib/buffer.js
+++ b/lib/buffer.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 /* eslint-disable require-buffer */
 'use strict';
 
diff --git a/lib/child_process.js b/lib/child_process.js
index 409dfff170cf4a..02d3b10fa0f945 100644
--- a/lib/child_process.js
+++ b/lib/child_process.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const util = require('util');
diff --git a/lib/cluster.js b/lib/cluster.js
index 02bf3d8f600776..d1eb67f6b062e2 100644
--- a/lib/cluster.js
+++ b/lib/cluster.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 module.exports = ('NODE_UNIQUE_ID' in process.env) ?
diff --git a/lib/console.js b/lib/console.js
index ba92c91636ba38..cd14a7ba1e396f 100644
--- a/lib/console.js
+++ b/lib/console.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const util = require('util');
diff --git a/lib/constants.js b/lib/constants.js
index c1cbf2db3cce37..1a38ecff8eb2d8 100644
--- a/lib/constants.js
+++ b/lib/constants.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 // This module is deprecated in documentation only. Users should be directed
diff --git a/lib/crypto.js b/lib/crypto.js
index 2d4695dc97e6fb..7f1d329b39ec18 100644
--- a/lib/crypto.js
+++ b/lib/crypto.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 // Note: In 0.8 and before, crypto functions all defaulted to using
 // binary-encoded strings rather than buffers.
 
diff --git a/lib/dgram.js b/lib/dgram.js
index 1fd83094de2e7b..314406897bfa64 100644
--- a/lib/dgram.js
+++ b/lib/dgram.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const assert = require('assert');
diff --git a/lib/dns.js b/lib/dns.js
index cbb994b8f271de..3be9129616b25e 100644
--- a/lib/dns.js
+++ b/lib/dns.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const util = require('util');
diff --git a/lib/domain.js b/lib/domain.js
index f45a623e8acafd..ef7b689d56e45e 100644
--- a/lib/domain.js
+++ b/lib/domain.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 // WARNING: THIS MODULE IS PENDING DEPRECATION.
diff --git a/lib/events.js b/lib/events.js
index 000fa98d5a88c5..4dc7ea82235c48 100644
--- a/lib/events.js
+++ b/lib/events.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 var domain;
diff --git a/lib/fs.js b/lib/fs.js
index fae2857e3fc759..2fac8424878d29 100644
--- a/lib/fs.js
+++ b/lib/fs.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 // Maintainers, keep in mind that ES1-style octal literals (`0666`) are not
 // allowed in strict mode. Use ES6-style octal literals instead (`0o666`).
 
diff --git a/lib/http.js b/lib/http.js
index 6931a0e26c138a..03084d755edb4b 100644
--- a/lib/http.js
+++ b/lib/http.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 exports.IncomingMessage = require('_http_incoming').IncomingMessage;
 
diff --git a/lib/https.js b/lib/https.js
index e59e7dfcb6beeb..398390bd28a379 100644
--- a/lib/https.js
+++ b/lib/https.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 require('internal/util').assertCrypto();
diff --git a/lib/internal/bootstrap_node.js b/lib/internal/bootstrap_node.js
index efdbc5d9e3ac48..f5d5e83f707678 100644
--- a/lib/internal/bootstrap_node.js
+++ b/lib/internal/bootstrap_node.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 // Hello, and welcome to hacking node.js!
 //
 // This file is invoked by node::LoadEnvironment in src/node.cc, and is
diff --git a/lib/internal/buffer.js b/lib/internal/buffer.js
index 744bf2dcab6ec4..3d64d0afc94986 100644
--- a/lib/internal/buffer.js
+++ b/lib/internal/buffer.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 if (!process.binding('config').hasIntl) {
diff --git a/lib/internal/child_process.js b/lib/internal/child_process.js
index 3c8764fc2ed092..9e972dbf8577aa 100644
--- a/lib/internal/child_process.js
+++ b/lib/internal/child_process.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const StringDecoder = require('string_decoder').StringDecoder;
diff --git a/lib/internal/cluster/child.js b/lib/internal/cluster/child.js
index 3275eec720c738..e96f56e2c95e9d 100644
--- a/lib/internal/cluster/child.js
+++ b/lib/internal/cluster/child.js
@@ -1,3 +1,5 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
 'use strict';
 const assert = require('assert');
 const util = require('util');
diff --git a/lib/internal/cluster/master.js b/lib/internal/cluster/master.js
index 9d5062f5427ffa..e6f7b6958ae388 100644
--- a/lib/internal/cluster/master.js
+++ b/lib/internal/cluster/master.js
@@ -1,3 +1,5 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
 'use strict';
 const assert = require('assert');
 const fork = require('child_process').fork;
diff --git a/lib/internal/cluster/round_robin_handle.js b/lib/internal/cluster/round_robin_handle.js
index 5dbc205426b1db..f4f3ead4185783 100644
--- a/lib/internal/cluster/round_robin_handle.js
+++ b/lib/internal/cluster/round_robin_handle.js
@@ -1,3 +1,5 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
 'use strict';
 const assert = require('assert');
 const net = require('net');
diff --git a/lib/internal/cluster/shared_handle.js b/lib/internal/cluster/shared_handle.js
index c0663772426213..8cf8d2f6cd8a35 100644
--- a/lib/internal/cluster/shared_handle.js
+++ b/lib/internal/cluster/shared_handle.js
@@ -1,3 +1,5 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
 'use strict';
 const assert = require('assert');
 const dgram = require('dgram');
diff --git a/lib/internal/cluster/utils.js b/lib/internal/cluster/utils.js
index ba72ff90945d3c..a9430e5ce4044b 100644
--- a/lib/internal/cluster/utils.js
+++ b/lib/internal/cluster/utils.js
@@ -1,3 +1,5 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
 'use strict';
 const util = require('util');
 
diff --git a/lib/internal/cluster/worker.js b/lib/internal/cluster/worker.js
index 687e4c12fecea4..bcf5157c604247 100644
--- a/lib/internal/cluster/worker.js
+++ b/lib/internal/cluster/worker.js
@@ -1,3 +1,5 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
 'use strict';
 const EventEmitter = require('events');
 const internalUtil = require('internal/util');
diff --git a/lib/internal/freelist.js b/lib/internal/freelist.js
index 580726e8725379..b8748a928b1165 100644
--- a/lib/internal/freelist.js
+++ b/lib/internal/freelist.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 // This is a free list to avoid creating so many of the same object.
diff --git a/lib/internal/fs.js b/lib/internal/fs.js
index 881679f99c4000..efe1467120a552 100644
--- a/lib/internal/fs.js
+++ b/lib/internal/fs.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const Buffer = require('buffer').Buffer;
diff --git a/lib/internal/linkedlist.js b/lib/internal/linkedlist.js
index 40bca91de25803..3d12f8fcce83f9 100644
--- a/lib/internal/linkedlist.js
+++ b/lib/internal/linkedlist.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 function init(list) {
diff --git a/lib/internal/module.js b/lib/internal/module.js
index 2f38618daac5f7..a18b43b53cc941 100644
--- a/lib/internal/module.js
+++ b/lib/internal/module.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 exports = module.exports = {
diff --git a/lib/internal/net.js b/lib/internal/net.js
index d19bc4c219a796..7a1c41678888ce 100644
--- a/lib/internal/net.js
+++ b/lib/internal/net.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 module.exports = { isLegalPort, assertPort };
diff --git a/lib/internal/process.js b/lib/internal/process.js
index 3f050b42cafe42..63fbeebd961eca 100644
--- a/lib/internal/process.js
+++ b/lib/internal/process.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 var _lazyConstants = null;
diff --git a/lib/internal/process/next_tick.js b/lib/internal/process/next_tick.js
index f27ef622a96e6a..4e9c12475b229b 100644
--- a/lib/internal/process/next_tick.js
+++ b/lib/internal/process/next_tick.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 exports.setup = setupNextTick;
diff --git a/lib/internal/process/promises.js b/lib/internal/process/promises.js
index 0e382d11d5523b..d64d8c5cc2f81f 100644
--- a/lib/internal/process/promises.js
+++ b/lib/internal/process/promises.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const promiseRejectEvent = process._promiseRejectEvent;
diff --git a/lib/internal/process/stdio.js b/lib/internal/process/stdio.js
index cf69657e40583e..35e91cf3434610 100644
--- a/lib/internal/process/stdio.js
+++ b/lib/internal/process/stdio.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 exports.setup = setupStdio;
diff --git a/lib/internal/process/warning.js b/lib/internal/process/warning.js
index bf487f38a417c4..baf9f916a8e894 100644
--- a/lib/internal/process/warning.js
+++ b/lib/internal/process/warning.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const config = process.binding('config');
diff --git a/lib/internal/readline.js b/lib/internal/readline.js
index 60fe946560aaaa..35fbfb19c14f3a 100644
--- a/lib/internal/readline.js
+++ b/lib/internal/readline.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 // Regex used for ansi escape code splitting
diff --git a/lib/internal/repl.js b/lib/internal/repl.js
index 7782d6b84bb8fe..59467d48d02708 100644
--- a/lib/internal/repl.js
+++ b/lib/internal/repl.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const Interface = require('readline').Interface;
diff --git a/lib/internal/socket_list.js b/lib/internal/socket_list.js
index 0f4be6df239dd6..040dda66465f2e 100644
--- a/lib/internal/socket_list.js
+++ b/lib/internal/socket_list.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 module.exports = {SocketListSend, SocketListReceive};
diff --git a/lib/internal/streams/BufferList.js b/lib/internal/streams/BufferList.js
index 76da94bc83d977..b0980e2fdd47a5 100644
--- a/lib/internal/streams/BufferList.js
+++ b/lib/internal/streams/BufferList.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const Buffer = require('buffer').Buffer;
diff --git a/lib/internal/streams/lazy_transform.js b/lib/internal/streams/lazy_transform.js
index bd68bef4b6dd17..87ecf7c117b3df 100644
--- a/lib/internal/streams/lazy_transform.js
+++ b/lib/internal/streams/lazy_transform.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 // LazyTransform is a special type of Transform stream that is lazily loaded.
 // This is used for performance with bi-API-ship: when two APIs are available
 // for the stream, one conventional and one non-conventional.
diff --git a/lib/internal/streams/legacy.js b/lib/internal/streams/legacy.js
index 3242b15eabdb0d..1f976b0118bc42 100644
--- a/lib/internal/streams/legacy.js
+++ b/lib/internal/streams/legacy.js
@@ -1,3 +1,5 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
 'use strict';
 
 const EE = require('events');
diff --git a/lib/internal/url.js b/lib/internal/url.js
index 2e3fec18fbae65..2cdb5be9112118 100644
--- a/lib/internal/url.js
+++ b/lib/internal/url.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const util = require('util');
diff --git a/lib/internal/util.js b/lib/internal/util.js
index 10844b645455dd..9c7ed70957e204 100644
--- a/lib/internal/util.js
+++ b/lib/internal/util.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const binding = process.binding('util');
diff --git a/lib/internal/v8_prof_processor.js b/lib/internal/v8_prof_processor.js
index 105ca30b12b705..b44e471176bc95 100644
--- a/lib/internal/v8_prof_processor.js
+++ b/lib/internal/v8_prof_processor.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 /* eslint-disable strict */
 const scriptFiles = [
   'internal/v8_prof_polyfill',
diff --git a/lib/module.js b/lib/module.js
index 9a6b641a753588..2eead5a60767f7 100644
--- a/lib/module.js
+++ b/lib/module.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const NativeModule = require('native_module');
diff --git a/lib/net.js b/lib/net.js
index 121309895343b7..c39f206a84a8d1 100644
--- a/lib/net.js
+++ b/lib/net.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const EventEmitter = require('events');
diff --git a/lib/os.js b/lib/os.js
index 7ab0ec5fa423be..5b8012b4f6149d 100644
--- a/lib/os.js
+++ b/lib/os.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const binding = process.binding('os');
diff --git a/lib/path.js b/lib/path.js
index 3ed587e0e0e167..22b95898fdbc58 100644
--- a/lib/path.js
+++ b/lib/path.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const inspect = require('util').inspect;
diff --git a/lib/process.js b/lib/process.js
index 43c8bf96f0bd48..45b980237589f4 100644
--- a/lib/process.js
+++ b/lib/process.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 // Re-export process as a native module
diff --git a/lib/querystring.js b/lib/querystring.js
index 9b4ca27640aa71..c7e7d073e35ed3 100644
--- a/lib/querystring.js
+++ b/lib/querystring.js
@@ -1,3 +1,8 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+// Query String Utilities
+
 'use strict';
 
 const QueryString = module.exports = {
diff --git a/lib/readline.js b/lib/readline.js
index f1b9db46af6ee1..27e08b1d670406 100644
--- a/lib/readline.js
+++ b/lib/readline.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 // Inspiration for this code comes from Salvatore Sanfilippo's linenoise.
 // https://github.com/antirez/linenoise
 // Reference:
diff --git a/lib/repl.js b/lib/repl.js
index fed89146dc9af7..e31f6d1e0f57e1 100644
--- a/lib/repl.js
+++ b/lib/repl.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 /* A repl library that you can include in your own code to get a runtime
  * interface to your program.
  *
diff --git a/lib/stream.js b/lib/stream.js
index a6b25a212508ab..47d1af530be5cd 100644
--- a/lib/stream.js
+++ b/lib/stream.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 // Note: export Stream before Readable/Writable/Duplex/...
diff --git a/lib/string_decoder.js b/lib/string_decoder.js
index 672ba185cc2821..7f9dcb77343b32 100644
--- a/lib/string_decoder.js
+++ b/lib/string_decoder.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const Buffer = require('buffer').Buffer;
diff --git a/lib/sys.js b/lib/sys.js
index 4d7d305daa056b..f03d81ac23eb2b 100644
--- a/lib/sys.js
+++ b/lib/sys.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 // the sys module was renamed to 'util'.
diff --git a/lib/timers.js b/lib/timers.js
index 6d456da36faf67..68e104346803ad 100644
--- a/lib/timers.js
+++ b/lib/timers.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const TimerWrap = process.binding('timer_wrap').Timer;
diff --git a/lib/tls.js b/lib/tls.js
index bb4719d9b02c93..e18c14adc69e09 100644
--- a/lib/tls.js
+++ b/lib/tls.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const internalUtil = require('internal/util');
diff --git a/lib/tty.js b/lib/tty.js
index 576144e4013064..0e3a004a715bb1 100644
--- a/lib/tty.js
+++ b/lib/tty.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const util = require('util');
diff --git a/lib/url.js b/lib/url.js
index 2b7dd6e5321977..31821069c470ff 100644
--- a/lib/url.js
+++ b/lib/url.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 function importPunycode() {
diff --git a/lib/util.js b/lib/util.js
index 46cde4d85bf28b..bd1457f46a41e7 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const uv = process.binding('uv');
diff --git a/lib/v8.js b/lib/v8.js
index 415aed593eb799..043c636ee77184 100644
--- a/lib/v8.js
+++ b/lib/v8.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 // Copyright (c) 2014, StrongLoop Inc.
 //
 // Permission to use, copy, modify, and/or distribute this software for any
diff --git a/lib/vm.js b/lib/vm.js
index cf672fbbc14871..0cc1e70aea0ca1 100644
--- a/lib/vm.js
+++ b/lib/vm.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const binding = process.binding('contextify');
diff --git a/lib/zlib.js b/lib/zlib.js
index b6817749bae35d..ad49d744800d4a 100644
--- a/lib/zlib.js
+++ b/lib/zlib.js
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 'use strict';
 
 const Buffer = require('buffer').Buffer;
diff --git a/src/async-wrap-inl.h b/src/async-wrap-inl.h
index 64b5f091612368..e0447f538b7dc7 100644
--- a/src/async-wrap-inl.h
+++ b/src/async-wrap-inl.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_ASYNC_WRAP_INL_H_
 #define SRC_ASYNC_WRAP_INL_H_
 
diff --git a/src/async-wrap.cc b/src/async-wrap.cc
index a0780566db72d8..a05363ff6b42b6 100644
--- a/src/async-wrap.cc
+++ b/src/async-wrap.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "async-wrap.h"
 #include "async-wrap-inl.h"
 #include "env.h"
diff --git a/src/async-wrap.h b/src/async-wrap.h
index d01c6ce9f9b724..9cc590bf152727 100644
--- a/src/async-wrap.h
+++ b/src/async-wrap.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_ASYNC_WRAP_H_
 #define SRC_ASYNC_WRAP_H_
 
diff --git a/src/backtrace_posix.cc b/src/backtrace_posix.cc
index 8fd798757a544a..8f8e2733e0d227 100644
--- a/src/backtrace_posix.cc
+++ b/src/backtrace_posix.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node.h"
 
 #if defined(__linux__)
diff --git a/src/backtrace_win32.cc b/src/backtrace_win32.cc
index 71610fd663bb3c..9ce935d6f0f53b 100644
--- a/src/backtrace_win32.cc
+++ b/src/backtrace_win32.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node.h"
 
 namespace node {
diff --git a/src/base-object-inl.h b/src/base-object-inl.h
index 4ddc5e1349bc13..e5a617d384f39d 100644
--- a/src/base-object-inl.h
+++ b/src/base-object-inl.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MITE
+
 #ifndef SRC_BASE_OBJECT_INL_H_
 #define SRC_BASE_OBJECT_INL_H_
 
diff --git a/src/base-object.h b/src/base-object.h
index 27251379770e2c..95ef099e78aa28 100644
--- a/src/base-object.h
+++ b/src/base-object.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_BASE_OBJECT_H_
 #define SRC_BASE_OBJECT_H_
 
diff --git a/src/base64.h b/src/base64.h
index 64c4e330c0db84..3a9b42f65e16fe 100644
--- a/src/base64.h
+++ b/src/base64.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_BASE64_H_
 #define SRC_BASE64_H_
 
diff --git a/src/cares_wrap.cc b/src/cares_wrap.cc
index 2b61209f6e643a..ccadfba3586bb1 100644
--- a/src/cares_wrap.cc
+++ b/src/cares_wrap.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #define CARES_STATICLIB
 #include "ares.h"
 #include "async-wrap.h"
diff --git a/src/connect_wrap.cc b/src/connect_wrap.cc
index df3f093e732972..cf719e8ed9bbef 100644
--- a/src/connect_wrap.cc
+++ b/src/connect_wrap.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "connect_wrap.h"
 
 #include "env.h"
diff --git a/src/connect_wrap.h b/src/connect_wrap.h
index 28d4872d7ed416..fbfad1dc0e3552 100644
--- a/src/connect_wrap.h
+++ b/src/connect_wrap.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_CONNECT_WRAP_H_
 #define SRC_CONNECT_WRAP_H_
 
diff --git a/src/connection_wrap.cc b/src/connection_wrap.cc
index 020fe8b4c9508c..44c0a4e38d29a6 100644
--- a/src/connection_wrap.cc
+++ b/src/connection_wrap.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "connection_wrap.h"
 
 #include "connect_wrap.h"
diff --git a/src/connection_wrap.h b/src/connection_wrap.h
index 7af97fd3f05e1b..05606f0b76ac4f 100644
--- a/src/connection_wrap.h
+++ b/src/connection_wrap.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_CONNECTION_WRAP_H_
 #define SRC_CONNECTION_WRAP_H_
 
diff --git a/src/debug-agent.cc b/src/debug-agent.cc
index 2d8ed8afc980ec..8179684c9422e6 100644
--- a/src/debug-agent.cc
+++ b/src/debug-agent.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 // Copyright Fedor Indutny and other Node contributors.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a
diff --git a/src/debug-agent.h b/src/debug-agent.h
index 0faa25f12470a9..7f52923afb126b 100644
--- a/src/debug-agent.h
+++ b/src/debug-agent.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 // Copyright Fedor Indutny and other Node contributors.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a
diff --git a/src/env-inl.h b/src/env-inl.h
index 1a17e2947d0597..3680abf325a9af 100644
--- a/src/env-inl.h
+++ b/src/env-inl.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_ENV_INL_H_
 #define SRC_ENV_INL_H_
 
diff --git a/src/env.cc b/src/env.cc
index 40f0c9ebd66a07..96bc59a6cc07ea 100644
--- a/src/env.cc
+++ b/src/env.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "env.h"
 #include "env-inl.h"
 #include "async-wrap.h"
diff --git a/src/env.h b/src/env.h
index 581d7e9aef3c67..cd832b9b9dca0a 100644
--- a/src/env.h
+++ b/src/env.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_ENV_H_
 #define SRC_ENV_H_
 
diff --git a/src/fs_event_wrap.cc b/src/fs_event_wrap.cc
index 025f511d93b1a5..96adb6b783dde4 100644
--- a/src/fs_event_wrap.cc
+++ b/src/fs_event_wrap.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "async-wrap.h"
 #include "async-wrap-inl.h"
 #include "env.h"
diff --git a/src/handle_wrap.cc b/src/handle_wrap.cc
index 317fb48b1d28e3..b043a8615e56db 100644
--- a/src/handle_wrap.cc
+++ b/src/handle_wrap.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "handle_wrap.h"
 #include "async-wrap.h"
 #include "async-wrap-inl.h"
diff --git a/src/handle_wrap.h b/src/handle_wrap.h
index 2a128dd8b1679d..58afb95485d97a 100644
--- a/src/handle_wrap.h
+++ b/src/handle_wrap.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_HANDLE_WRAP_H_
 #define SRC_HANDLE_WRAP_H_
 
diff --git a/src/inspector_agent.cc b/src/inspector_agent.cc
index ae2e666384b5af..d4f6b7618db50c 100644
--- a/src/inspector_agent.cc
+++ b/src/inspector_agent.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "inspector_agent.h"
 
 #include "inspector_socket_server.h"
diff --git a/src/inspector_agent.h b/src/inspector_agent.h
index 9cc2fa676d4d13..f64a6ac336ce24 100644
--- a/src/inspector_agent.h
+++ b/src/inspector_agent.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_INSPECTOR_AGENT_H_
 #define SRC_INSPECTOR_AGENT_H_
 
diff --git a/src/inspector_socket.cc b/src/inspector_socket.cc
index 6edc08248b6a85..07620f1d71142f 100644
--- a/src/inspector_socket.cc
+++ b/src/inspector_socket.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "inspector_socket.h"
 #include "util.h"
 #include "util-inl.h"
diff --git a/src/inspector_socket.h b/src/inspector_socket.h
index 558d87bcb76bf1..500501d278357a 100644
--- a/src/inspector_socket.h
+++ b/src/inspector_socket.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_INSPECTOR_SOCKET_H_
 #define SRC_INSPECTOR_SOCKET_H_
 
diff --git a/src/inspector_socket_server.cc b/src/inspector_socket_server.cc
index ee44a69a683690..9cb3d22d62c1ef 100644
--- a/src/inspector_socket_server.cc
+++ b/src/inspector_socket_server.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "inspector_socket_server.h"
 
 #include "node.h"
diff --git a/src/inspector_socket_server.h b/src/inspector_socket_server.h
index b82d9ee6013a40..5e3226345ab785 100644
--- a/src/inspector_socket_server.h
+++ b/src/inspector_socket_server.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_INSPECTOR_SOCKET_SERVER_H_
 #define SRC_INSPECTOR_SOCKET_SERVER_H_
 
diff --git a/src/js_stream.cc b/src/js_stream.cc
index e51c4ae9b35084..f0a6d7156861b7 100644
--- a/src/js_stream.cc
+++ b/src/js_stream.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "js_stream.h"
 
 #include "async-wrap.h"
diff --git a/src/js_stream.h b/src/js_stream.h
index 5a1244bc463e36..81d67ef1e4932b 100644
--- a/src/js_stream.h
+++ b/src/js_stream.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_JS_STREAM_H_
 #define SRC_JS_STREAM_H_
 
diff --git a/src/node.cc b/src/node.cc
index a678c177f3db79..c8db321747ea1a 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node.h"
 #include "node_buffer.h"
 #include "node_constants.h"
diff --git a/src/node.h b/src/node.h
index 1255a4af7f11ce..b3258a8332289e 100644
--- a/src/node.h
+++ b/src/node.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_H_
 #define SRC_NODE_H_
 
diff --git a/src/node_buffer.cc b/src/node_buffer.cc
index 1f86cf8b3f7ae5..fa2c9eb9ce0792 100644
--- a/src/node_buffer.cc
+++ b/src/node_buffer.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node.h"
 #include "node_buffer.h"
 
diff --git a/src/node_buffer.h b/src/node_buffer.h
index 686450d984e6f9..0882d897787c21 100644
--- a/src/node_buffer.h
+++ b/src/node_buffer.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_BUFFER_H_
 #define SRC_NODE_BUFFER_H_
 
diff --git a/src/node_config.cc b/src/node_config.cc
index 60001207f1851b..680932e4e817bd 100644
--- a/src/node_config.cc
+++ b/src/node_config.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node.h"
 #include "node_i18n.h"
 #include "env.h"
diff --git a/src/node_constants.cc b/src/node_constants.cc
index 8aa65ee7e23c35..51be933d5c4a20 100644
--- a/src/node_constants.cc
+++ b/src/node_constants.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node_constants.h"
 #include "env.h"
 #include "env-inl.h"
diff --git a/src/node_constants.h b/src/node_constants.h
index 7ba6ec3bd1b015..b83bfe39fb549d 100644
--- a/src/node_constants.h
+++ b/src/node_constants.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_CONSTANTS_H_
 #define SRC_NODE_CONSTANTS_H_
 
diff --git a/src/node_contextify.cc b/src/node_contextify.cc
index 4efb420fa128b7..7ee5a2dee9da1f 100644
--- a/src/node_contextify.cc
+++ b/src/node_contextify.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node.h"
 #include "node_internals.h"
 #include "node_watchdog.h"
diff --git a/src/node_counters.cc b/src/node_counters.cc
index 092d990d16b3e5..6c0ccb5d4b288d 100644
--- a/src/node_counters.cc
+++ b/src/node_counters.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node_counters.h"
 #include "uv.h"
 #include "env.h"
diff --git a/src/node_counters.h b/src/node_counters.h
index 117db1079e9865..e3a5e8c484549a 100644
--- a/src/node_counters.h
+++ b/src/node_counters.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_COUNTERS_H_
 #define SRC_NODE_COUNTERS_H_
 
diff --git a/src/node_crypto.cc b/src/node_crypto.cc
index 283d84f82d37c7..189312df6b897d 100644
--- a/src/node_crypto.cc
+++ b/src/node_crypto.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node.h"
 #include "node_buffer.h"
 #include "node_crypto.h"
diff --git a/src/node_crypto.h b/src/node_crypto.h
index 175206c40df586..4a32e7b2669fdc 100644
--- a/src/node_crypto.h
+++ b/src/node_crypto.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_CRYPTO_H_
 #define SRC_NODE_CRYPTO_H_
 
diff --git a/src/node_crypto_bio.cc b/src/node_crypto_bio.cc
index a862573c280acb..920a701eb7fadc 100644
--- a/src/node_crypto_bio.cc
+++ b/src/node_crypto_bio.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node_crypto_bio.h"
 #include "openssl/bio.h"
 #include "util.h"
diff --git a/src/node_crypto_bio.h b/src/node_crypto_bio.h
index ed6b46b53237cf..65656e3a29bdad 100644
--- a/src/node_crypto_bio.h
+++ b/src/node_crypto_bio.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_CRYPTO_BIO_H_
 #define SRC_NODE_CRYPTO_BIO_H_
 
diff --git a/src/node_crypto_clienthello-inl.h b/src/node_crypto_clienthello-inl.h
index 108383bf2d542a..43d87cd25af150 100644
--- a/src/node_crypto_clienthello-inl.h
+++ b/src/node_crypto_clienthello-inl.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_CRYPTO_CLIENTHELLO_INL_H_
 #define SRC_NODE_CRYPTO_CLIENTHELLO_INL_H_
 
diff --git a/src/node_crypto_clienthello.cc b/src/node_crypto_clienthello.cc
index 8c862c1b6a5198..8b7a799f2a8425 100644
--- a/src/node_crypto_clienthello.cc
+++ b/src/node_crypto_clienthello.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node_crypto_clienthello.h"
 #include "node_crypto_clienthello-inl.h"
 #include "node_buffer.h"  // Buffer
diff --git a/src/node_crypto_clienthello.h b/src/node_crypto_clienthello.h
index 3550807c20d05f..702cef92d61176 100644
--- a/src/node_crypto_clienthello.h
+++ b/src/node_crypto_clienthello.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_CRYPTO_CLIENTHELLO_H_
 #define SRC_NODE_CRYPTO_CLIENTHELLO_H_
 
diff --git a/src/node_crypto_groups.h b/src/node_crypto_groups.h
index 2817f4c92620af..131e56d38bb15d 100644
--- a/src/node_crypto_groups.h
+++ b/src/node_crypto_groups.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_CRYPTO_GROUPS_H_
 #define SRC_NODE_CRYPTO_GROUPS_H_
 
diff --git a/src/node_debug_options.cc b/src/node_debug_options.cc
index 410e23acb3101b..d741573d2bfcc6 100644
--- a/src/node_debug_options.cc
+++ b/src/node_debug_options.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node_debug_options.h"
 
 #include <errno.h>
diff --git a/src/node_debug_options.h b/src/node_debug_options.h
index d03bdb15497bbf..f3c105fdabff4f 100644
--- a/src/node_debug_options.h
+++ b/src/node_debug_options.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_DEBUG_OPTIONS_H_
 #define SRC_NODE_DEBUG_OPTIONS_H_
 
diff --git a/src/node_dtrace.cc b/src/node_dtrace.cc
index 8653b673755fde..6c090e91af330a 100644
--- a/src/node_dtrace.cc
+++ b/src/node_dtrace.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node_dtrace.h"
 
 #ifdef HAVE_DTRACE
diff --git a/src/node_dtrace.h b/src/node_dtrace.h
index 5d192a60f716aa..5095d0f7510937 100644
--- a/src/node_dtrace.h
+++ b/src/node_dtrace.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_DTRACE_H_
 #define SRC_NODE_DTRACE_H_
 
diff --git a/src/node_file.cc b/src/node_file.cc
index 0abb88088786ae..03c5d26cb999b4 100644
--- a/src/node_file.cc
+++ b/src/node_file.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node.h"
 #include "node_file.h"
 #include "node_buffer.h"
diff --git a/src/node_file.h b/src/node_file.h
index 76dbe80348de39..c95860f6857c2a 100644
--- a/src/node_file.h
+++ b/src/node_file.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_FILE_H_
 #define SRC_NODE_FILE_H_
 
diff --git a/src/node_http_parser.cc b/src/node_http_parser.cc
index f757cd6797058d..304e436f9e292f 100644
--- a/src/node_http_parser.cc
+++ b/src/node_http_parser.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node.h"
 #include "node_buffer.h"
 #include "node_http_parser.h"
diff --git a/src/node_http_parser.h b/src/node_http_parser.h
index 5fbe6f130594a6..17489ffacca410 100644
--- a/src/node_http_parser.h
+++ b/src/node_http_parser.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_HTTP_PARSER_H_
 #define SRC_NODE_HTTP_PARSER_H_
 
diff --git a/src/node_i18n.cc b/src/node_i18n.cc
index a98fdca4d1bffd..e9784a56b9c496 100644
--- a/src/node_i18n.cc
+++ b/src/node_i18n.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 /*
  * notes: by srl295
  *  - When in NODE_HAVE_SMALL_ICU mode, ICU is linked against "stub" (null) data
diff --git a/src/node_i18n.h b/src/node_i18n.h
index 21a579526ddc1a..7687e0e5b4b1f2 100644
--- a/src/node_i18n.h
+++ b/src/node_i18n.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_I18N_H_
 #define SRC_NODE_I18N_H_
 
diff --git a/src/node_internals.h b/src/node_internals.h
index 7c1b79d62f09c5..b8e9f134376bb8 100644
--- a/src/node_internals.h
+++ b/src/node_internals.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_INTERNALS_H_
 #define SRC_NODE_INTERNALS_H_
 
diff --git a/src/node_javascript.cc b/src/node_javascript.cc
index 3f6d6c82a85269..060ae063c3b395 100644
--- a/src/node_javascript.cc
+++ b/src/node_javascript.cc
@@ -1,3 +1,5 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
 #include "node.h"
 #include "node_natives.h"
 #include "v8.h"
diff --git a/src/node_javascript.h b/src/node_javascript.h
index 738d81957253e2..e70b6ee631a52a 100644
--- a/src/node_javascript.h
+++ b/src/node_javascript.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_JAVASCRIPT_H_
 #define SRC_NODE_JAVASCRIPT_H_
 
diff --git a/src/node_lttng.cc b/src/node_lttng.cc
index 490beb6e40007d..39c28c8ef90c1b 100644
--- a/src/node_lttng.cc
+++ b/src/node_lttng.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "util.h"
 
 #ifdef HAVE_LTTNG
diff --git a/src/node_lttng.h b/src/node_lttng.h
index edd802eb6e49f7..80fe49496edf6b 100644
--- a/src/node_lttng.h
+++ b/src/node_lttng.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_LTTNG_H_
 #define SRC_NODE_LTTNG_H_
 
diff --git a/src/node_lttng_provider.h b/src/node_lttng_provider.h
index 5913f39752caba..37aaff5985c4fd 100644
--- a/src/node_lttng_provider.h
+++ b/src/node_lttng_provider.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_LTTNG_PROVIDER_H_
 #define SRC_NODE_LTTNG_PROVIDER_H_
 
diff --git a/src/node_lttng_tp.h b/src/node_lttng_tp.h
index b529bfad5e4b58..7596349a62b9f0 100644
--- a/src/node_lttng_tp.h
+++ b/src/node_lttng_tp.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_LTTNG_TP_H_
 #define SRC_NODE_LTTNG_TP_H_
 
diff --git a/src/node_main.cc b/src/node_main.cc
index 16bda81ae64091..7a95d3bed28425 100644
--- a/src/node_main.cc
+++ b/src/node_main.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node.h"
 
 #ifdef _WIN32
diff --git a/src/node_mutex.h b/src/node_mutex.h
index 9e1d31654f7dbf..f47c7eb9fc2ae3 100644
--- a/src/node_mutex.h
+++ b/src/node_mutex.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_MUTEX_H_
 #define SRC_NODE_MUTEX_H_
 
diff --git a/src/node_object_wrap.h b/src/node_object_wrap.h
index 8f695fd9dd0679..767aa1fc610595 100644
--- a/src/node_object_wrap.h
+++ b/src/node_object_wrap.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_OBJECT_WRAP_H_
 #define SRC_NODE_OBJECT_WRAP_H_
 
diff --git a/src/node_os.cc b/src/node_os.cc
index 97b1a1d08da6ed..adf35d2c8d7d70 100644
--- a/src/node_os.cc
+++ b/src/node_os.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node.h"
 #include "v8.h"
 #include "env.h"
diff --git a/src/node_revert.cc b/src/node_revert.cc
index 48f03a89a3131e..bc22054d4d05cd 100644
--- a/src/node_revert.cc
+++ b/src/node_revert.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node_revert.h"
 #include <stdio.h>
 #include <string.h>
diff --git a/src/node_revert.h b/src/node_revert.h
index b4c3633e947a6e..a0009021923a74 100644
--- a/src/node_revert.h
+++ b/src/node_revert.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_REVERT_H_
 #define SRC_NODE_REVERT_H_
 
@@ -6,10 +9,10 @@
 #include "node.h"
 
 /**
- * Note that it is expected for this list to vary across specific LTS and 
- * Stable versions! Only CVE's whose fixes require *breaking* changes within 
- * a given LTS or Stable may be added to this list, and only with CTC 
- * consensus. 
+ * Note that it is expected for this list to vary across specific LTS and
+ * Stable versions! Only CVE's whose fixes require *breaking* changes within
+ * a given LTS or Stable may be added to this list, and only with CTC
+ * consensus.
  *
  * For *master* this list should always be empty!
  *
diff --git a/src/node_root_certs.h b/src/node_root_certs.h
index 972c1d33248500..13bdf900fb10e6 100644
--- a/src/node_root_certs.h
+++ b/src/node_root_certs.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
 
 /* GlobalSign Root CA */
diff --git a/src/node_stat_watcher.cc b/src/node_stat_watcher.cc
index cff92e34045a1e..41ab7561bd6a90 100644
--- a/src/node_stat_watcher.cc
+++ b/src/node_stat_watcher.cc
@@ -1,3 +1,5 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
 #include "node_stat_watcher.h"
 #include "async-wrap.h"
 #include "async-wrap-inl.h"
diff --git a/src/node_stat_watcher.h b/src/node_stat_watcher.h
index 99cae5880351f7..69572e8f85d37b 100644
--- a/src/node_stat_watcher.h
+++ b/src/node_stat_watcher.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_STAT_WATCHER_H_
 #define SRC_NODE_STAT_WATCHER_H_
 
diff --git a/src/node_url.cc b/src/node_url.cc
index 0d5e695a3c13a5..ed4ed377c63ecd 100644
--- a/src/node_url.cc
+++ b/src/node_url.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node_url.h"
 #include "node.h"
 #include "node_internals.h"
diff --git a/src/node_url.h b/src/node_url.h
index 198c29938b7d22..eb5cffbd3191f2 100644
--- a/src/node_url.h
+++ b/src/node_url.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_URL_H_
 #define SRC_NODE_URL_H_
 
diff --git a/src/node_util.cc b/src/node_util.cc
index a1387353e3d9a5..1734217905703b 100644
--- a/src/node_util.cc
+++ b/src/node_util.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node.h"
 #include "node_watchdog.h"
 #include "v8.h"
diff --git a/src/node_v8.cc b/src/node_v8.cc
index 7059922607089d..8223d0f7324d78 100644
--- a/src/node_v8.cc
+++ b/src/node_v8.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node.h"
 #include "env.h"
 #include "env-inl.h"
diff --git a/src/node_version.h b/src/node_version.h
index b7760cf04ba46d..a961bfb343ee2c 100644
--- a/src/node_version.h
+++ b/src/node_version.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_VERSION_H_
 #define SRC_NODE_VERSION_H_
 
diff --git a/src/node_watchdog.cc b/src/node_watchdog.cc
index 5d95c4132f1b3f..d0ef930216dc6c 100644
--- a/src/node_watchdog.cc
+++ b/src/node_watchdog.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node_watchdog.h"
 #include "node_internals.h"
 #include "util.h"
diff --git a/src/node_watchdog.h b/src/node_watchdog.h
index 2d55d782d0af5d..effa2619b46894 100644
--- a/src/node_watchdog.h
+++ b/src/node_watchdog.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_WATCHDOG_H_
 #define SRC_NODE_WATCHDOG_H_
 
diff --git a/src/node_win32_etw_provider-inl.h b/src/node_win32_etw_provider-inl.h
index efc11ab0b95108..368ba84f15e66d 100644
--- a/src/node_win32_etw_provider-inl.h
+++ b/src/node_win32_etw_provider-inl.h
@@ -1,3 +1,7 @@
+// Copyright Node.js contributors. All rights reserved.
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_WIN32_ETW_PROVIDER_INL_H_
 #define SRC_NODE_WIN32_ETW_PROVIDER_INL_H_
 
diff --git a/src/node_win32_etw_provider.cc b/src/node_win32_etw_provider.cc
index 7b766bd2bb99b8..70f426ba73d4b9 100644
--- a/src/node_win32_etw_provider.cc
+++ b/src/node_win32_etw_provider.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node_dtrace.h"
 #include "node_win32_etw_provider.h"
 #include "node_etw_provider.h"
diff --git a/src/node_win32_etw_provider.h b/src/node_win32_etw_provider.h
index baf9e38539f559..a1b6ef8ccca4ab 100644
--- a/src/node_win32_etw_provider.h
+++ b/src/node_win32_etw_provider.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_WIN32_ETW_PROVIDER_H_
 #define SRC_NODE_WIN32_ETW_PROVIDER_H_
 
diff --git a/src/node_win32_perfctr_provider.cc b/src/node_win32_perfctr_provider.cc
index ebb299e4c54758..b19ff111f4746c 100644
--- a/src/node_win32_perfctr_provider.cc
+++ b/src/node_win32_perfctr_provider.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #define __INIT_node_perfctr_provider_IMP
 #include "node_counters.h"
 #include "node_win32_perfctr_provider.h"
diff --git a/src/node_win32_perfctr_provider.h b/src/node_win32_perfctr_provider.h
index 315e32b0297e4d..1f6b5d218133f6 100644
--- a/src/node_win32_perfctr_provider.h
+++ b/src/node_win32_perfctr_provider.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_WIN32_PERFCTR_PROVIDER_H_
 #define SRC_NODE_WIN32_PERFCTR_PROVIDER_H_
 
diff --git a/src/node_wrap.h b/src/node_wrap.h
index 15cea7beda7de8..a1763a9dd09935 100644
--- a/src/node_wrap.h
+++ b/src/node_wrap.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_WRAP_H_
 #define SRC_NODE_WRAP_H_
 
diff --git a/src/node_zlib.cc b/src/node_zlib.cc
index 0b85e6a1d60921..3f7d24328beb56 100644
--- a/src/node_zlib.cc
+++ b/src/node_zlib.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "node.h"
 #include "node_buffer.h"
 
diff --git a/src/pipe_wrap.cc b/src/pipe_wrap.cc
index 5f47dadddb4d96..a940a7f339c177 100644
--- a/src/pipe_wrap.cc
+++ b/src/pipe_wrap.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "pipe_wrap.h"
 
 #include "async-wrap.h"
diff --git a/src/pipe_wrap.h b/src/pipe_wrap.h
index 9dcfa91bac8579..16e2f1e5410ec3 100644
--- a/src/pipe_wrap.h
+++ b/src/pipe_wrap.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_PIPE_WRAP_H_
 #define SRC_PIPE_WRAP_H_
 
diff --git a/src/process_wrap.cc b/src/process_wrap.cc
index 8c8e4704be4f82..0576bc454ee86f 100644
--- a/src/process_wrap.cc
+++ b/src/process_wrap.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "env.h"
 #include "env-inl.h"
 #include "handle_wrap.h"
diff --git a/src/req-wrap-inl.h b/src/req-wrap-inl.h
index 84af22023dc3b9..26d462fb00960b 100644
--- a/src/req-wrap-inl.h
+++ b/src/req-wrap-inl.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_REQ_WRAP_INL_H_
 #define SRC_REQ_WRAP_INL_H_
 
diff --git a/src/req-wrap.h b/src/req-wrap.h
index 0fddae67460d6f..87f523a6a5e749 100644
--- a/src/req-wrap.h
+++ b/src/req-wrap.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_REQ_WRAP_H_
 #define SRC_REQ_WRAP_H_
 
diff --git a/src/signal_wrap.cc b/src/signal_wrap.cc
index 582d1a9ecfdc02..b008b8106b0b30 100644
--- a/src/signal_wrap.cc
+++ b/src/signal_wrap.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "async-wrap.h"
 #include "async-wrap-inl.h"
 #include "env.h"
diff --git a/src/spawn_sync.cc b/src/spawn_sync.cc
index 93e51af38f65ae..f1d55cd0a84ab2 100644
--- a/src/spawn_sync.cc
+++ b/src/spawn_sync.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "spawn_sync.h"
 #include "env-inl.h"
 #include "string_bytes.h"
diff --git a/src/spawn_sync.h b/src/spawn_sync.h
index 676df43b759bf1..e094f2527d976d 100644
--- a/src/spawn_sync.h
+++ b/src/spawn_sync.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_SPAWN_SYNC_H_
 #define SRC_SPAWN_SYNC_H_
 
diff --git a/src/stream_base-inl.h b/src/stream_base-inl.h
index da636909b695f3..cf654899d4e0bc 100644
--- a/src/stream_base-inl.h
+++ b/src/stream_base-inl.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_STREAM_BASE_INL_H_
 #define SRC_STREAM_BASE_INL_H_
 
diff --git a/src/stream_base.cc b/src/stream_base.cc
index 3ed622d7ef35a2..4992471861a16e 100644
--- a/src/stream_base.cc
+++ b/src/stream_base.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "stream_base.h"
 #include "stream_base-inl.h"
 #include "stream_wrap.h"
diff --git a/src/stream_base.h b/src/stream_base.h
index faddee88c82786..1f7c36d024849d 100644
--- a/src/stream_base.h
+++ b/src/stream_base.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_STREAM_BASE_H_
 #define SRC_STREAM_BASE_H_
 
diff --git a/src/stream_wrap.cc b/src/stream_wrap.cc
index ac656505503b22..9e87547a3ea4e2 100644
--- a/src/stream_wrap.cc
+++ b/src/stream_wrap.cc
@@ -1,3 +1,5 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
 #include "stream_wrap.h"
 #include "stream_base.h"
 #include "stream_base-inl.h"
diff --git a/src/stream_wrap.h b/src/stream_wrap.h
index e930670202d2d8..0542e89850e163 100644
--- a/src/stream_wrap.h
+++ b/src/stream_wrap.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_STREAM_WRAP_H_
 #define SRC_STREAM_WRAP_H_
 
diff --git a/src/string_bytes.cc b/src/string_bytes.cc
index 882ca6e3e89bd3..483f862f8864c0 100644
--- a/src/string_bytes.cc
+++ b/src/string_bytes.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "string_bytes.h"
 
 #include "base64.h"
diff --git a/src/string_bytes.h b/src/string_bytes.h
index 75d70defe38104..54a5bc91c23bc0 100644
--- a/src/string_bytes.h
+++ b/src/string_bytes.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_STRING_BYTES_H_
 #define SRC_STRING_BYTES_H_
 
diff --git a/src/string_search.cc b/src/string_search.cc
index 326fba7c4abf05..0bd224bb63e70c 100644
--- a/src/string_search.cc
+++ b/src/string_search.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "string_search.h"
 
 namespace node {
diff --git a/src/string_search.h b/src/string_search.h
index abc69edb87621d..f35b31bf359c95 100644
--- a/src/string_search.h
+++ b/src/string_search.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
diff --git a/src/tcp_wrap.cc b/src/tcp_wrap.cc
index b2617a5695719e..36fc55f88b4c18 100644
--- a/src/tcp_wrap.cc
+++ b/src/tcp_wrap.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MITE
+
 #include "tcp_wrap.h"
 
 #include "connection_wrap.h"
diff --git a/src/tcp_wrap.h b/src/tcp_wrap.h
index 2b9e288dced6aa..1f1daa92744074 100644
--- a/src/tcp_wrap.h
+++ b/src/tcp_wrap.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_TCP_WRAP_H_
 #define SRC_TCP_WRAP_H_
 
diff --git a/src/timer_wrap.cc b/src/timer_wrap.cc
index 843fde4673b071..8c885795a8def2 100644
--- a/src/timer_wrap.cc
+++ b/src/timer_wrap.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "async-wrap.h"
 #include "async-wrap-inl.h"
 #include "env.h"
diff --git a/src/tls_wrap.cc b/src/tls_wrap.cc
index d56128fec6c5ce..05ad70667fbff5 100644
--- a/src/tls_wrap.cc
+++ b/src/tls_wrap.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "tls_wrap.h"
 #include "async-wrap.h"
 #include "async-wrap-inl.h"
diff --git a/src/tls_wrap.h b/src/tls_wrap.h
index f390c9fe9281f7..aec8bedc7feb0b 100644
--- a/src/tls_wrap.h
+++ b/src/tls_wrap.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_TLS_WRAP_H_
 #define SRC_TLS_WRAP_H_
 
diff --git a/src/tracing/agent.cc b/src/tracing/agent.cc
index ceab09e5a2789c..ad5b5c91a1ed2a 100644
--- a/src/tracing/agent.cc
+++ b/src/tracing/agent.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "tracing/agent.h"
 
 #include <sstream>
diff --git a/src/tracing/agent.h b/src/tracing/agent.h
index f6cb5af97f4bbc..b149635d0f6c8a 100644
--- a/src/tracing/agent.h
+++ b/src/tracing/agent.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_TRACING_AGENT_H_
 #define SRC_TRACING_AGENT_H_
 
diff --git a/src/tracing/node_trace_buffer.cc b/src/tracing/node_trace_buffer.cc
index 4e99361cbefee3..179e5fddc80742 100644
--- a/src/tracing/node_trace_buffer.cc
+++ b/src/tracing/node_trace_buffer.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "tracing/node_trace_buffer.h"
 
 namespace node {
diff --git a/src/tracing/node_trace_buffer.h b/src/tracing/node_trace_buffer.h
index 296c958b80e3fa..57ac2c694d03d3 100644
--- a/src/tracing/node_trace_buffer.h
+++ b/src/tracing/node_trace_buffer.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_TRACE_BUFFER_H_
 #define SRC_NODE_TRACE_BUFFER_H_
 
diff --git a/src/tracing/node_trace_writer.cc b/src/tracing/node_trace_writer.cc
index 41753c5e65e557..25ff5291cd19a2 100644
--- a/src/tracing/node_trace_writer.cc
+++ b/src/tracing/node_trace_writer.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "tracing/node_trace_writer.h"
 
 #include <string.h>
diff --git a/src/tracing/node_trace_writer.h b/src/tracing/node_trace_writer.h
index 5813db0ab1fd33..68c90755b59632 100644
--- a/src/tracing/node_trace_writer.h
+++ b/src/tracing/node_trace_writer.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_NODE_TRACE_WRITER_H_
 #define SRC_NODE_TRACE_WRITER_H_
 
diff --git a/src/tracing/trace_event.cc b/src/tracing/trace_event.cc
index b83cae6e05c10c..84c3769920932d 100644
--- a/src/tracing/trace_event.cc
+++ b/src/tracing/trace_event.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "tracing/trace_event.h"
 
 namespace node {
diff --git a/src/tracing/trace_event.h b/src/tracing/trace_event.h
index a035fd51500bb9..300fbc3a4bbb81 100644
--- a/src/tracing/trace_event.h
+++ b/src/tracing/trace_event.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
diff --git a/src/tty_wrap.cc b/src/tty_wrap.cc
index 26f061b99b34e8..0f2e342c4385ea 100644
--- a/src/tty_wrap.cc
+++ b/src/tty_wrap.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "tty_wrap.h"
 
 #include "env.h"
diff --git a/src/tty_wrap.h b/src/tty_wrap.h
index 5e0517598b0922..16697fedd0774d 100644
--- a/src/tty_wrap.h
+++ b/src/tty_wrap.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_TTY_WRAP_H_
 #define SRC_TTY_WRAP_H_
 
diff --git a/src/udp_wrap.cc b/src/udp_wrap.cc
index d14eefd64d600a..795ac93d2c34d6 100644
--- a/src/udp_wrap.cc
+++ b/src/udp_wrap.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "udp_wrap.h"
 #include "env.h"
 #include "env-inl.h"
diff --git a/src/udp_wrap.h b/src/udp_wrap.h
index ad5f92c0f52bcb..2e2b0955c10ad9 100644
--- a/src/udp_wrap.h
+++ b/src/udp_wrap.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_UDP_WRAP_H_
 #define SRC_UDP_WRAP_H_
 
diff --git a/src/util-inl.h b/src/util-inl.h
index 82ab6632773854..02620bd82a5cd3 100644
--- a/src/util-inl.h
+++ b/src/util-inl.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MITSE
+
 #ifndef SRC_UTIL_INL_H_
 #define SRC_UTIL_INL_H_
 
diff --git a/src/util.cc b/src/util.cc
index 9fb5c3fd2855d3..50626d40b3eeac 100644
--- a/src/util.cc
+++ b/src/util.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "util.h"
 #include "string_bytes.h"
 #include "node_buffer.h"
diff --git a/src/util.h b/src/util.h
index b32f2b8a71ca0f..e4dfa1c68a392d 100644
--- a/src/util.h
+++ b/src/util.h
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #ifndef SRC_UTIL_H_
 #define SRC_UTIL_H_
 
diff --git a/src/uv.cc b/src/uv.cc
index c0e742bf159d98..b7dd6f15fe26df 100644
--- a/src/uv.cc
+++ b/src/uv.cc
@@ -1,3 +1,6 @@
+// Copyright Node.js contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 #include "uv.h"
 #include "node.h"
 #include "env.h"
diff --git a/src/v8abbr.h b/src/v8abbr.h
index 5c5e7e24493a0e..83abffbab18ee3 100644
--- a/src/v8abbr.h
+++ b/src/v8abbr.h
@@ -1,4 +1,6 @@
-/** Copyright Joyent, Inc. and other Node contributors.
+/**
+* SPDX-License-Identifier: MIT
+* Copyright Joyent, Inc. and other Node contributors.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
diff --git a/test/CPPLINT.cfg b/test/CPPLINT.cfg
new file mode 100644
index 00000000000000..88c6f99113d516
--- /dev/null
+++ b/test/CPPLINT.cfg
@@ -0,0 +1 @@
+filter=-legal/copyright
diff --git a/tools/CPPLINT.cfg b/tools/CPPLINT.cfg
new file mode 100644
index 00000000000000..88c6f99113d516
--- /dev/null
+++ b/tools/CPPLINT.cfg
@@ -0,0 +1 @@
+filter=-legal/copyright
diff --git a/tools/cpplint.py b/tools/cpplint.py
index b5a05f0af39ba7..358671452d0963 100644
--- a/tools/cpplint.py
+++ b/tools/cpplint.py
@@ -264,8 +264,7 @@
 _DEFAULT_FILTERS = [
     '-build/include',
     '-build/include_alpha',
-    '-build/include_order',
-    '-legal/copyright',
+    '-build/include_order'
     ]
 
 # The default list of categories suppressed for C (not C++) files.
@@ -1692,12 +1691,20 @@ def CheckForCopyright(filename, lines, error):
   # We'll say it should occur by line 10. Don't forget there's a
   # dummy line at the front.
   for line in xrange(1, min(len(lines), 11)):
-    if re.search(r'Copyright', lines[line], re.I): break
+    if (re.search(r'Copyright node.js contributors. All rights reserved.',
+                  lines[line], re.I) or
+        re.search(r'Copyright', lines[line], re.I)): break
   else:                       # means no copyright line was found
     error(filename, 0, 'legal/copyright', 5,
           'No copyright message found.  '
-          'You should have a line: "Copyright [year] <Copyright Owner>"')
-
+          'You should have a line: "Copyright Node.js contributors. '
+          'All rights reserved."')
+  for line in xrange(1, min(len(lines), 11)):
+    if re.search(r'SPDX-License-Identifier: MIT', lines[line], re.I): break
+  else:
+    error(filename, 0, 'legal/copyright', 5,
+          'No SPDX license identifier found.  '
+          'You should have a line: "SPDX-License-Identifier: MIT"')
 
 def GetIndentLevel(line):
   """Return the number of leading spaces in line.
diff --git a/tools/eslint-rules/no-copyright.js b/tools/eslint-rules/no-copyright.js
new file mode 100644
index 00000000000000..a2246326015bee
--- /dev/null
+++ b/tools/eslint-rules/no-copyright.js
@@ -0,0 +1,46 @@
+/**
+ * @fileoverview Verify copyright header
+ * @author James M Snell
+ */
+'use strict';
+
+const copyright = /Copyright Node\.js contributors\. All rights reserved\./;
+const spdx = /SPDX-License-Identifier: MIT/;
+
+module.exports = function(context) {
+
+  const state = {
+    copyright: 0,
+    spdx: 0
+  };
+
+  function process(node) {
+    if (copyright.test(node.value))
+      state.copyright++;
+    if (spdx.test(node.value))
+      state.spdx++;
+  }
+
+  return {
+    'BlockComment': process,
+    'LineComment': process,
+    'Program:exit': function(node) {
+      if (state.copyright === 0) {
+        context.report(node,
+                       'The Node.js Copyright comment is required');
+      }
+      if (state.copyright > 1) {
+        context.report(node,
+                       'There should be only one Node.js Copyright comment');
+      }
+      if (state.spdx === 0) {
+        context.report(node,
+                       'The Node.js SPDX License comment is required');
+      }
+      if (state.spdx > 1) {
+        context.report(node,
+                       'There should be only one Node.js SPDX License comment');
+      }
+    }
+  };
+};