Switch to Apache-2.0 only license (like Aeron)

userFRM · claude · userFRM · commit 726c9ecbb52b · 2026-03-16T14:52:52.000+01:00
- Remove MIT license option, use Apache-2.0 exclusively
- Delete LICENSE-MIT
- Update all SPDX headers in 11 .rs files
- Update README badge, license section
- Update CHANGELOG

Co-Authored-By: Claude Opus 4.6 (1M context) &lt;noreply@anthropic.com&gt;
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -137,4 +137,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Criterion benchmarks with `disruptor` v4.0.0 comparison
 - Market data example (4-topic fan-out, ~160M msg/s)
 - SPDX license headers on all source files
-- Dual license: MIT OR Apache-2.0
+- License: Apache-2.0
diff --git a/Cargo.toml b/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.6.0"
 edition = "2021"
 rust-version = "1.70"
 description = "Ultra-low-latency SPMC pub/sub using seqlock-stamped ring buffers. no_std compatible."
-license = "MIT OR Apache-2.0"
+license = "Apache-2.0"
 keywords = ["pubsub", "spmc", "seqlock", "no_std", "zero-alloc"]
 categories = ["concurrency", "no-std"]
 readme = "README.md"
diff --git a/LICENSE-MIT b/LICENSE-MIT
diff --git a/README.md b/README.md
@@ -2,7 +2,7 @@
 
 [![Crates.io](https://img.shields.io/crates/v/photon-ring.svg)](https://crates.io/crates/photon-ring)
 [![docs.rs](https://docs.rs/photon-ring/badge.svg)](https://docs.rs/photon-ring)
-[![License](https://img.shields.io/crates/l/photon-ring.svg)](LICENSE-MIT)
+[![License](https://img.shields.io/badge/license-Apache--2.0-blue.svg)](LICENSE-APACHE)
 [![no_std](https://img.shields.io/badge/no__std-compatible-brightgreen.svg)](https://docs.rs/photon-ring)
 
 **Ultra-low-latency SPMC inter-thread messaging using seqlock-stamped ring buffers.**
@@ -396,5 +396,4 @@ cargo +nightly miri test --test correctness -- --test-threads=1
 
 ## License
 
-Licensed under either of [Apache License, Version 2.0](LICENSE-APACHE) or
-[MIT License](LICENSE-MIT) at your option.
+Licensed under the [Apache License, Version 2.0](LICENSE-APACHE).
diff --git a/benches/rdtsc_oneway.rs b/benches/rdtsc_oneway.rs
@@ -1,5 +1,5 @@
 // Copyright 2026 Photon Ring Contributors
-// SPDX-License-Identifier: MIT OR Apache-2.0
+// SPDX-License-Identifier: Apache-2.0
 
 // RDTSC-based one-way latency measurement.
 //
diff --git a/benches/throughput.rs b/benches/throughput.rs
@@ -1,5 +1,5 @@
 // Copyright 2026 Photon Ring Contributors
-// SPDX-License-Identifier: MIT OR Apache-2.0
+// SPDX-License-Identifier: Apache-2.0
 
 use criterion::{criterion_group, criterion_main, Criterion};
 use std::hint::black_box;
diff --git a/examples/backpressure.rs b/examples/backpressure.rs
@@ -1,5 +1,5 @@
 // Copyright 2026 Photon Ring Contributors
-// SPDX-License-Identifier: MIT OR Apache-2.0
+// SPDX-License-Identifier: Apache-2.0
 
 //! Backpressure example: reliable order fill pipeline.
 //!
diff --git a/examples/market_data.rs b/examples/market_data.rs
@@ -1,5 +1,5 @@
 // Copyright 2026 Photon Ring Contributors
-// SPDX-License-Identifier: MIT OR Apache-2.0
+// SPDX-License-Identifier: Apache-2.0
 
 use photon_ring::Photon;
 use std::thread;
diff --git a/examples/pinned_latency.rs b/examples/pinned_latency.rs
@@ -1,5 +1,5 @@
 // Copyright 2026 Photon Ring Contributors
-// SPDX-License-Identifier: MIT OR Apache-2.0
+// SPDX-License-Identifier: Apache-2.0
 
 //! Core-pinned cross-thread latency measurement.
 //!
diff --git a/src/affinity.rs b/src/affinity.rs
@@ -1,5 +1,5 @@
 // Copyright 2026 Photon Ring Contributors
-// SPDX-License-Identifier: MIT OR Apache-2.0
+// SPDX-License-Identifier: Apache-2.0
 
 //! CPU core affinity helpers for deterministic cross-core latency.
 //!
diff --git a/src/bus.rs b/src/bus.rs
@@ -1,5 +1,5 @@
 // Copyright 2026 Photon Ring Contributors
-// SPDX-License-Identifier: MIT OR Apache-2.0
+// SPDX-License-Identifier: Apache-2.0
 
 use alloc::string::{String, ToString};
 
diff --git a/src/channel.rs b/src/channel.rs
@@ -1,5 +1,5 @@
 // Copyright 2026 Photon Ring Contributors
-// SPDX-License-Identifier: MIT OR Apache-2.0
+// SPDX-License-Identifier: Apache-2.0
 
 use crate::ring::{Padded, SharedRing};
 use crate::wait::WaitStrategy;
diff --git a/src/lib.rs b/src/lib.rs
@@ -1,5 +1,5 @@
 // Copyright 2026 Photon Ring Contributors
-// SPDX-License-Identifier: MIT OR Apache-2.0
+// SPDX-License-Identifier: Apache-2.0
 
 //! # Photon Ring
 //!
diff --git a/src/mem.rs b/src/mem.rs
@@ -1,5 +1,5 @@
 // Copyright 2026 Photon Ring Contributors
-// SPDX-License-Identifier: MIT OR Apache-2.0
+// SPDX-License-Identifier: Apache-2.0
 
 //! Platform-specific memory control for ring buffer allocation.
 //!
diff --git a/src/ring.rs b/src/ring.rs
@@ -1,5 +1,5 @@
 // Copyright 2026 Photon Ring Contributors
-// SPDX-License-Identifier: MIT OR Apache-2.0
+// SPDX-License-Identifier: Apache-2.0
 
 use crate::slot::Slot;
 use alloc::boxed::Box;
diff --git a/src/slot.rs b/src/slot.rs
@@ -1,5 +1,5 @@
 // Copyright 2026 Photon Ring Contributors
-// SPDX-License-Identifier: MIT OR Apache-2.0
+// SPDX-License-Identifier: Apache-2.0
 
 use core::cell::UnsafeCell;
 use core::mem::MaybeUninit;
diff --git a/src/wait.rs b/src/wait.rs
@@ -1,5 +1,5 @@
 // Copyright 2026 Photon Ring Contributors
-// SPDX-License-Identifier: MIT OR Apache-2.0
+// SPDX-License-Identifier: Apache-2.0
 
 //! Wait strategies for blocking receive operations.
 //!
diff --git a/tests/correctness.rs b/tests/correctness.rs
@@ -1,5 +1,5 @@
 // Copyright 2026 Photon Ring Contributors
-// SPDX-License-Identifier: MIT OR Apache-2.0
+// SPDX-License-Identifier: Apache-2.0
 
 use photon_ring::{channel, channel_bounded, Photon, PublishError, TryRecvError};
 
