pbower · pbower · Mar 28, 2026 · Mar 28, 2026
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -202,7 +202,7 @@ When fixing bugs:
 
 4. ### Licensing
 
-- All contributions are accepted under the project’s MIT licence.
+- All contributions are accepted under the project’s Apache-2.0 licence.
 - By submitting a contribution, you confirm that you have the legal right to do so and agree to the Contributor Licence Agreement (`CLA.md`).
 - Please ensure no code is copied or derived from other repositories or source without appropriate rights or permissions.
 

diff --git a/Cargo.toml b/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.9.3"
 edition = "2024"
 authors = ['Peter G. Bower']
 build = "build.rs"
-license = "MIT"
+license = "Apache-2.0"
 readme = "README.md"
 repository = "https://github.com/pbower/minarrow"
 documentation = "https://docs.rs/minarrow/"

diff --git a/LICENSE b/LICENSE
@@ -1,11 +1,16 @@
-The MIT License (MIT)
 Copyright © 2025 Peter Garfield Bower
 
-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+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
 
-The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+    http://www.apache.org/licenses/LICENSE-2.0
 
-THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+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.
 
 ---------------------------------------------------------------------------------------------------
 

diff --git a/README.md b/README.md
@@ -200,7 +200,7 @@ See [CONTRIBUTING.md](CONTRIBUTING.md) for details.
 
 Copyright © 2025–2026 Peter Garfield Bower.
 
-Released under the MIT License. See [LICENSE](LICENSE) for details.
+Released under the Apache 2.0 License. See [LICENSE](LICENSE) for details.
 
 ## Acknowledgements
 

diff --git a/pyo3/Cargo.toml b/pyo3/Cargo.toml
@@ -3,7 +3,7 @@ name = "minarrow-pyo3"
 version = "0.2.0"
 edition = "2024"
 authors = ['Peter G. Bower']
-license = "MIT"
+license = "Apache-2.0"
 readme = "README.md"
 repository = "https://github.com/pbower/minarrow"
 documentation = "https://docs.rs/minarrow-pyo3/"

diff --git a/pyo3/README.md b/pyo3/README.md
@@ -296,4 +296,4 @@ The following are copied during import because they require structural transform
 
 ## License
 
-MIT
+Apache-2.0
diff --git a/pyo3/pyproject.toml b/pyo3/pyproject.toml
@@ -8,7 +8,7 @@ version = "0.1.0"
 description = "PyO3 bindings for MinArrow - zero-copy Arrow interop with Python"
 readme = "README.md"
 requires-python = ">=3.9"
-license = { text = "MIT" }
+license = "Apache-2.0"
 authors = [
     { name = "Peter G. Bower" }
 ]
@@ -17,7 +17,7 @@ classifiers = [
     "Development Status :: 4 - Beta",
     "Intended Audience :: Developers",
     "Intended Audience :: Science/Research",
-    "License :: OSI Approved :: MIT License",
+    "License :: OSI Approved :: Apache-2.0 License",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",

diff --git a/src/kernels/arithmetic/dispatch.rs b/src/kernels/arithmetic/dispatch.rs
@@ -1,5 +1,5 @@
 // Copyright Peter Bower 2025. All Rights Reserved.
-// Licensed under MIT License.
+// Licensed under Apache-2.0.
 
 //! # **Arithmetic Dispatch Module** - *SIMD/Scalar Dispatch Layer for Arithmetic Operations*
 //!

diff --git a/src/kernels/arithmetic/mod.rs b/src/kernels/arithmetic/mod.rs
@@ -1,5 +1,5 @@
 // Copyright Peter Bower 2025. All Rights Reserved.
-// Licensed under MIT License.
+// Licensed under Apache-2.0.
 
 //! # **Arithmetic Kernels Module** - *High-Performance Arithmetic*
 //!

diff --git a/src/kernels/arithmetic/simd.rs b/src/kernels/arithmetic/simd.rs
@@ -1,5 +1,5 @@
 // Copyright Peter Bower 2025. All Rights Reserved.
-// Licensed under MIT License.
+// Licensed under Apache-2.0.
 
 //! # **SIMD Arithmetic Kernels Module** - *High-Performance Arithmetic*
 //!

diff --git a/src/kernels/arithmetic/std.rs b/src/kernels/arithmetic/std.rs
@@ -1,5 +1,5 @@
 // Copyright Peter Bower 2025. All Rights Reserved.
-// Licensed under MIT License.
+// Licensed under Apache-2.0.
 
 //! # **Standard Arithmetic Kernels Module** - *Scalar Fallback / Non-SIMD Implementations*
 //!

diff --git a/src/kernels/arithmetic/string.rs b/src/kernels/arithmetic/string.rs
@@ -1,5 +1,5 @@
 // Copyright Peter Bower 2025. All Rights Reserved.
-// Licensed under MIT License.
+// Licensed under Apache-2.0.
 
 //! # **String Arithmetic Module** - *String Operations with Numeric Interactions*
 //!

diff --git a/src/kernels/arithmetic/string_ops.rs b/src/kernels/arithmetic/string_ops.rs
@@ -1,5 +1,5 @@
 // Copyright Peter Bower 2025. All Rights Reserved.
-// Licensed under MIT License.
+// Licensed under Apache-2.0.
 
 //! Basic string operations for arithmetic module
 

diff --git a/src/kernels/arithmetic/types.rs b/src/kernels/arithmetic/types.rs
@@ -1,5 +1,5 @@
 // Copyright Peter Bower 2025. All Rights Reserved.
-// Licensed under MIT License.
+// Licensed under Apache-2.0.
 
 //! # Value Arithmetic Operators
 //!

diff --git a/src/kernels/bitmask/dispatch.rs b/src/kernels/bitmask/dispatch.rs
@@ -1,5 +1,5 @@
 // Copyright Peter Bower 2025. All Rights Reserved.
-// Licensed under MIT License.
+// Licensed under Apache-2.0.
 
 //! # **Bitmask Dispatch Module** - *Compile-Time SIMD/Scalar Selection for Bitmask Operations*
 //!

diff --git a/src/kernels/bitmask/mod.rs b/src/kernels/bitmask/mod.rs
@@ -1,5 +1,5 @@
 // Copyright Peter Bower 2025. All Rights Reserved.
-// Licensed under MIT License.
+// Licensed under Apache-2.0.
 
 //! # **Bitmask Kernels Module** - *High-Performance Null-Aware Bitmask Operations*
 //!

diff --git a/src/kernels/bitmask/simd.rs b/src/kernels/bitmask/simd.rs
@@ -1,5 +1,5 @@
 // Copyright Peter Bower 2025. All Rights Reserved.
-// Licensed under MIT License.
+// Licensed under Apache-2.0.
 
 //! # **Bitmask SIMD Kernels** - *Vectorised High-Performance Bitmask Operations*
 //!

diff --git a/src/kernels/bitmask/std.rs b/src/kernels/bitmask/std.rs
@@ -1,5 +1,5 @@
 // Copyright Peter Bower 2025. All Rights Reserved.
-// Licensed under MIT License.
+// Licensed under Apache-2.0.
 
 //! # **Bitmask Scalar Kernels** - *Word-Level Bitmask Operations*
 //!

diff --git a/src/kernels/broadcast/cube.rs b/src/kernels/broadcast/cube.rs
@@ -1,5 +1,5 @@
 // Copyright Peter Bower 2025. All Rights Reserved.
-// Licensed under MIT License.
+// Licensed under Apache-2.0.
 
 use std::sync::Arc;
 

diff --git a/src/kernels/broadcast/mod.rs b/src/kernels/broadcast/mod.rs
@@ -1,5 +1,5 @@
 // Copyright Peter Bower 2025. All Rights Reserved.
-// Licensed under MIT License.
+// Licensed under Apache-2.0.
 
 //! # Broadcasting Operations Module
 //!

diff --git a/src/kernels/broadcast/super_array.rs b/src/kernels/broadcast/super_array.rs
@@ -1,5 +1,5 @@
 // Copyright Peter Bower 2025. All Rights Reserved.
-// Licensed under MIT License.
+// Licensed under Apache-2.0.
 
 use std::sync::Arc;
 

diff --git a/src/kernels/broadcast/table.rs b/src/kernels/broadcast/table.rs
@@ -1,5 +1,5 @@
 // Copyright Peter Bower 2025. All Rights Reserved.
-// Licensed under MIT License.
+// Licensed under Apache-2.0.
 
 use std::sync::Arc;
 

diff --git a/src/kernels/routing/arithmetic.rs b/src/kernels/routing/arithmetic.rs
@@ -1,5 +1,5 @@
 // Copyright Peter Bower 2025. All Rights Reserved.
-// Licensed under MIT License.
+// Licensed under Apache-2.0.
 
 #[cfg(feature = "scalar_type")]
 use crate::Scalar;

diff --git a/src/kernels/routing/binary_map.rs b/src/kernels/routing/binary_map.rs
@@ -1,5 +1,5 @@
 // Copyright Peter Bower 2025. All Rights Reserved.
-// Licensed under MIT License.
+// Licensed under Apache-2.0.
 
 //! # Binary Map Module
 //!

diff --git a/src/kernels/routing/broadcast.rs b/src/kernels/routing/broadcast.rs
@@ -1,5 +1,5 @@
 // Copyright Peter Bower 2025. All Rights Reserved.
-// Licensed under MIT License.
+// Licensed under Apache-2.0.
 
 use std::marker::PhantomData;
 

diff --git a/src/kernels/routing/mod.rs b/src/kernels/routing/mod.rs
@@ -1,5 +1,5 @@
 // Copyright Peter Bower 2025. All Rights Reserved.
-// Licensed under MIT License.
+// Licensed under Apache-2.0.
 
 //! # Routing Module
 //!

diff --git a/src/kernels/string.rs b/src/kernels/string.rs
@@ -1,5 +1,5 @@
 // Copyright Peter Bower 2025. All Rights Reserved.
-// Licensed under MIT License.
+// Licensed under Apache-2.0.
 
 //! # **String Operations Kernels Module** - *High-Performance String Processing and Text Analysis*
 //!

diff --git a/src/lib.rs b/src/lib.rs
@@ -10,7 +10,7 @@
 //! - **High runtime performance** – see benchmarks below.
 //! - Cohesive, well-documented API with extensive coverage.
 //! - Built-in FFI with simple `to_apache_arrow()` and `to_polars()` conversions.
-//! - MIT Licensed.
+//! - Apache-2.0 Licensed.
 //!
 //! ## Upcoming Additions
 //! 1. **Lightstream-IO** – IPC streaming and Tokio async integration.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -296,4 +296,4 @@ The following are copied during import because they require structural transform

		## License

		MIT
		Apache-2.0