Switch Dgraph back to Apache 2.0 (#2652)

While the promise of Commons Clause is a great one, i.e. restricting resale while allowing proprietary usage, its subjective implementation generates a lot of friction and confusion for the open source community.

Being an open source developer at heart, I'm glad to be bringing Dgraph back to Apache 2.0 license. It is something that we started off with, but then got lost into the AGPL woods. At the end of the day, Apache license is the gold standard of licenses, and something open source users (i.e. the world) feel very comfortable with. The vision for Dgraph is to bring graph databases mainstream, allowing them to be the primary databases holding the source of truth, and that's only possible if it can be adopted by any company, big or small, without any concerns.

**Apache license lets achieve that vision.**

We will be adding proprietary features later on under an enterprise license, but as long as I'm in charge, we're not moving the core away from Apache 2.0 license. This is it.

Author: manishrjain

LICENSE.md

@@ -2,9 +2,9 @@
 
 Copyright 2016-2018 Dgraph Labs, Inc.
 
-Licensed under the Apache License, Version 2.0 (the "License") and the Commons
-Clause Restriction; you may not use this file except in compliance with the
-License. You may obtain a copy of the License at
+Source code in this repository is licensed under the Apache Public License 2.0
+(APL). A copy of APL is present in this repository, and is also available online
+at
 
     http://www.apache.org/licenses/LICENSE-2.0
 
@@ -13,28 +13,6 @@ under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 CONDITIONS OF ANY KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations under the License.
 
-### Commons Clause Restriction
-
-The Software is provided to you by the Licensor under the License, as defined
-below, subject to the following condition.  Without limiting other conditions in
-the License, the grant of rights under the License will not include, and the
-License does not grant to you, the right to Sell the Software.  For purposes of
-the foregoing, “Sell” means practicing any or all of the rights granted to you
-under the License to provide to third parties, for a fee or other consideration
-(including without limitation fees for hosting or consulting/ support services
-related to the Software), a product or service whose value derives, entirely or
-substantially, from the functionality of the Software. Any license notice or
-attribution required by the License must also include this Commons Cause License
-Condition notice.
-
-For purposes of the clause above, the “Licensor” is Dgraph Labs, Inc., the
-“License” is the Apache License, Version 2.0, and the Software is the Dgraph
-software provided with this notice.
-
-You may obtain a copy of the clause at
-
-    https://commonsclause.com/
-
 ## Trademark
 
 Dgraph is a registered trademark of Dgraph Labs, Inc.

README.md

@@ -84,7 +84,7 @@ makes it easy to build applications with it.
 | Full Text Search | Native support | Native support | Via External Indexing System |
 | Regular Expressions | Native support | Native support | Via External Indexing System |
 | Geo Search | Native support | External support only | Via External Indexing System |
-| License | Apache 2.0 + Commons Clause | GPL v3 | Apache 2.0 |
+| License | Apache 2.0 | GPL v3 | Apache 2.0 |
 
 ## Users
 - **Dgraph official documentation is present at [docs.dgraph.io](https://docs.dgraph.io).**
@@ -108,7 +108,7 @@ makes it easy to build applications with it.
 ## Unofficial Client Libraries
 The Dgraph team maintain a number of [officially supported client libraries](https://docs.dgraph.io/clients/).  The following libraries are contributed by the community.
 
-**C# .NET**  
+**C# .NET**
 
 * [https://github.com/AlexandreDaSilva/DgraphNet](https://github.com/AlexandreDaSilva/DgraphNet)
 * [https://github.com/MichaelJCompton/Dgraph-dotnet](https://github.com/MichaelJCompton/Dgraph-dotnet)

algo/doc.go

@@ -1,8 +1,17 @@
 /*
- * Copyright 2016-2018 Dgraph Labs, Inc.
+ * Copyright 2016-2018 Dgraph Labs, Inc. and Contributors
  *
- * This file is available under the Apache License, Version 2.0,
- * with the Commons Clause restriction.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 
 // Package algo contains algorithms such as merging, intersecting sorted lists.

algo/heap.go

@@ -1,8 +1,17 @@
 /*
- * Copyright 2016-2018 Dgraph Labs, Inc.
+ * Copyright 2016-2018 Dgraph Labs, Inc. and Contributors
  *
- * This file is available under the Apache License, Version 2.0,
- * with the Commons Clause restriction.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 
 package algo

algo/heap_test.go

@@ -1,8 +1,17 @@
 /*
- * Copyright 2016-2018 Dgraph Labs, Inc.
+ * Copyright 2016-2018 Dgraph Labs, Inc. and Contributors
  *
- * This file is available under the Apache License, Version 2.0,
- * with the Commons Clause restriction.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 
 package algo

algo/uidlist.go

@@ -1,8 +1,17 @@
 /*
- * Copyright 2016-2018 Dgraph Labs, Inc.
+ * Copyright 2016-2018 Dgraph Labs, Inc. and Contributors
  *
- * This file is available under the Apache License, Version 2.0,
- * with the Commons Clause restriction.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 
 package algo

algo/uidlist_test.go

@@ -1,8 +1,17 @@
 /*
- * Copyright 2016-2018 Dgraph Labs, Inc.
+ * Copyright 2016-2018 Dgraph Labs, Inc. and Contributors
  *
- * This file is available under the Apache License, Version 2.0,
- * with the Commons Clause restriction.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 
 package algo

conn/node.go

@@ -1,8 +1,17 @@
 /*
- * Copyright 2017-2018 Dgraph Labs, Inc.
+ * Copyright 2017-2018 Dgraph Labs, Inc. and Contributors
  *
- * This file is available under the Apache License, Version 2.0,
- * with the Commons Clause restriction.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 
 package conn

conn/node_test.go

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2018 Dgraph Labs, Inc. and Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package conn
 
 import (

conn/pool.go

@@ -1,8 +1,17 @@
 /*
- * Copyright 2016-2018 Dgraph Labs, Inc.
+ * Copyright 2016-2018 Dgraph Labs, Inc. and Contributors
  *
- * This file is available under the Apache License, Version 2.0,
- * with the Commons Clause restriction.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 
 package conn