diff --git a/zerocopy/src/byte_slice.rs b/zerocopy/src/byte_slice.rs
index 6f9ee9ac33..2c5ea3a5e8 100644
--- a/zerocopy/src/byte_slice.rs
+++ b/zerocopy/src/byte_slice.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2024 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
diff --git a/zerocopy/src/byteorder.rs b/zerocopy/src/byteorder.rs
index 206fde3850..efe5862125 100644
--- a/zerocopy/src/byteorder.rs
+++ b/zerocopy/src/byteorder.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2019 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
diff --git a/zerocopy/src/deprecated.rs b/zerocopy/src/deprecated.rs
index 61b29aa5f4..97be761def 100644
--- a/zerocopy/src/deprecated.rs
+++ b/zerocopy/src/deprecated.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2024 The Fuchsia Authors
 //
 // Licensed under the 2-Clause BSD License <LICENSE-BSD or
diff --git a/zerocopy/src/doctests.rs b/zerocopy/src/doctests.rs
index 989f1be194..264359ccc5 100644
--- a/zerocopy/src/doctests.rs
+++ b/zerocopy/src/doctests.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2025 The Fuchsia Authors
 //
 // Licensed under the 2-Clause BSD License <LICENSE-BSD or
diff --git a/zerocopy/src/error.rs b/zerocopy/src/error.rs
index 05fdfe3b91..76214b641e 100644
--- a/zerocopy/src/error.rs
+++ b/zerocopy/src/error.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2024 The Fuchsia Authors
 //
 // Licensed under the 2-Clause BSD License <LICENSE-BSD or
diff --git a/zerocopy/src/impls.rs b/zerocopy/src/impls.rs
index 80538bfc8a..5ecd54c9d9 100644
--- a/zerocopy/src/impls.rs
+++ b/zerocopy/src/impls.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2024 The Fuchsia Authors
 //
 // Licensed under the 2-Clause BSD License <LICENSE-BSD or
@@ -1357,7 +1359,7 @@ mod simd {
         #[cfg(not(no_zerocopy_aarch64_simd_1_59_0))]
         simd_arch_mod!(
             #[cfg(all(
-                target_arch = "aarch64", 
+                target_arch = "aarch64",
                 any(
                     target_endian = "little",
                     not(no_zerocopy_aarch64_simd_be_1_87_0)
diff --git a/zerocopy/src/layout.rs b/zerocopy/src/layout.rs
index 19ad5ca85f..68a2b7ad2b 100644
--- a/zerocopy/src/layout.rs
+++ b/zerocopy/src/layout.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2024 The Fuchsia Authors
 //
 // Licensed under the 2-Clause BSD License <LICENSE-BSD or
diff --git a/zerocopy/src/lib.rs b/zerocopy/src/lib.rs
index fbf9b6ba86..0eefe53bbc 100644
--- a/zerocopy/src/lib.rs
+++ b/zerocopy/src/lib.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2018 The Fuchsia Authors
 //
 // Licensed under the 2-Clause BSD License <LICENSE-BSD or
@@ -2833,7 +2835,7 @@ pub unsafe trait TryFromBytes {
     /// ```
     ///
     /// [`try_mut_from_bytes`]: TryFromBytes::try_mut_from_bytes
-    ///  
+    ///
     #[doc = codegen_header!("h5", "try_mut_from_bytes_with_elems")]
     ///
     /// See [`TryFromBytes::try_ref_from_bytes_with_elems`](#method.try_ref_from_bytes_with_elems.codegen).
diff --git a/zerocopy/src/macros.rs b/zerocopy/src/macros.rs
index 948f8f912b..bae08d19cc 100644
--- a/zerocopy/src/macros.rs
+++ b/zerocopy/src/macros.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2024 The Fuchsia Authors
 //
 // Licensed under the 2-Clause BSD License <LICENSE-BSD or
diff --git a/zerocopy/src/pointer/inner.rs b/zerocopy/src/pointer/inner.rs
index c8dd9f01f4..023df07d04 100644
--- a/zerocopy/src/pointer/inner.rs
+++ b/zerocopy/src/pointer/inner.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2024 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
diff --git a/zerocopy/src/pointer/invariant.rs b/zerocopy/src/pointer/invariant.rs
index 2af211dd9f..f7680af5ad 100644
--- a/zerocopy/src/pointer/invariant.rs
+++ b/zerocopy/src/pointer/invariant.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2024 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
diff --git a/zerocopy/src/pointer/mod.rs b/zerocopy/src/pointer/mod.rs
index 4c3658679d..bdb283fdac 100644
--- a/zerocopy/src/pointer/mod.rs
+++ b/zerocopy/src/pointer/mod.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2023 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
diff --git a/zerocopy/src/pointer/ptr.rs b/zerocopy/src/pointer/ptr.rs
index 307b2aee63..487f01fa36 100644
--- a/zerocopy/src/pointer/ptr.rs
+++ b/zerocopy/src/pointer/ptr.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2023 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
diff --git a/zerocopy/src/pointer/transmute.rs b/zerocopy/src/pointer/transmute.rs
index 45b4f727fd..14d36acb4f 100644
--- a/zerocopy/src/pointer/transmute.rs
+++ b/zerocopy/src/pointer/transmute.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2025 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
diff --git a/zerocopy/src/ref.rs b/zerocopy/src/ref.rs
index 496afc435c..1a9cdc8f04 100644
--- a/zerocopy/src/ref.rs
+++ b/zerocopy/src/ref.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2024 The Fuchsia Authors
 //
 // Licensed under the 2-Clause BSD License <LICENSE-BSD or
diff --git a/zerocopy/src/split_at.rs b/zerocopy/src/split_at.rs
index 1d7b2c7d60..1695a0d740 100644
--- a/zerocopy/src/split_at.rs
+++ b/zerocopy/src/split_at.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2025 The Fuchsia Authors
 //
 // Licensed under the 2-Clause BSD License <LICENSE-BSD or
diff --git a/zerocopy/src/util/macro_util.rs b/zerocopy/src/util/macro_util.rs
index 2235d0b8b4..bc8aaf79dd 100644
--- a/zerocopy/src/util/macro_util.rs
+++ b/zerocopy/src/util/macro_util.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2022 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
diff --git a/zerocopy/src/util/macros.rs b/zerocopy/src/util/macros.rs
index 7dca5410c8..ebee9615cf 100644
--- a/zerocopy/src/util/macros.rs
+++ b/zerocopy/src/util/macros.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2023 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
diff --git a/zerocopy/src/util/mod.rs b/zerocopy/src/util/mod.rs
index 1a6c0b22a4..77e56a1076 100644
--- a/zerocopy/src/util/mod.rs
+++ b/zerocopy/src/util/mod.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2023 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
diff --git a/zerocopy/src/wrappers.rs b/zerocopy/src/wrappers.rs
index f3930eb7eb..8b52996108 100644
--- a/zerocopy/src/wrappers.rs
+++ b/zerocopy/src/wrappers.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2023 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
diff --git a/zerocopy/zerocopy-derive/src/derive/from_bytes.rs b/zerocopy/zerocopy-derive/src/derive/from_bytes.rs
index ad8b6233fe..20ebd57965 100644
--- a/zerocopy/zerocopy-derive/src/derive/from_bytes.rs
+++ b/zerocopy/zerocopy-derive/src/derive/from_bytes.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 use proc_macro2::{Span, TokenStream};
 use syn::{
     parse_quote, Data, DataEnum, DataStruct, DataUnion, Error, Expr, ExprLit, ExprUnary, Lit, UnOp,
diff --git a/zerocopy/zerocopy-derive/src/derive/into_bytes.rs b/zerocopy/zerocopy-derive/src/derive/into_bytes.rs
index 8c1e1009dd..a1510a4e39 100644
--- a/zerocopy/zerocopy-derive/src/derive/into_bytes.rs
+++ b/zerocopy/zerocopy-derive/src/derive/into_bytes.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 use proc_macro2::{Span, TokenStream};
 use quote::quote;
 use syn::{Data, DataEnum, DataStruct, DataUnion, Error, Type};
diff --git a/zerocopy/zerocopy-derive/src/derive/known_layout.rs b/zerocopy/zerocopy-derive/src/derive/known_layout.rs
index fb43002d71..ed4e3f7fe4 100644
--- a/zerocopy/zerocopy-derive/src/derive/known_layout.rs
+++ b/zerocopy/zerocopy-derive/src/derive/known_layout.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 use proc_macro2::TokenStream;
 use quote::quote;
 use syn::{parse_quote, Data, Error, Type};
diff --git a/zerocopy/zerocopy-derive/src/derive/mod.rs b/zerocopy/zerocopy-derive/src/derive/mod.rs
index 88911b43df..28b56b16a6 100644
--- a/zerocopy/zerocopy-derive/src/derive/mod.rs
+++ b/zerocopy/zerocopy-derive/src/derive/mod.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 pub mod from_bytes;
 pub mod into_bytes;
 pub mod known_layout;
diff --git a/zerocopy/zerocopy-derive/src/derive/try_from_bytes.rs b/zerocopy/zerocopy-derive/src/derive/try_from_bytes.rs
index 15b4d94c83..8a7741f397 100644
--- a/zerocopy/zerocopy-derive/src/derive/try_from_bytes.rs
+++ b/zerocopy/zerocopy-derive/src/derive/try_from_bytes.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 use proc_macro2::TokenStream;
 use quote::quote;
 use syn::{
diff --git a/zerocopy/zerocopy-derive/src/derive/unaligned.rs b/zerocopy/zerocopy-derive/src/derive/unaligned.rs
index 819d84984a..2890021f8b 100644
--- a/zerocopy/zerocopy-derive/src/derive/unaligned.rs
+++ b/zerocopy/zerocopy-derive/src/derive/unaligned.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 use proc_macro2::{Span, TokenStream};
 use syn::{Data, DataEnum, DataStruct, DataUnion, Error};
 
diff --git a/zerocopy/zerocopy-derive/src/lib.rs b/zerocopy/zerocopy-derive/src/lib.rs
index e3b7884c10..a9ac732f8a 100644
--- a/zerocopy/zerocopy-derive/src/lib.rs
+++ b/zerocopy/zerocopy-derive/src/lib.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2019 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
diff --git a/zerocopy/zerocopy-derive/src/repr.rs b/zerocopy/zerocopy-derive/src/repr.rs
index 57014b38b2..3b1063ce3d 100644
--- a/zerocopy/zerocopy-derive/src/repr.rs
+++ b/zerocopy/zerocopy-derive/src/repr.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2019 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
diff --git a/zerocopy/zerocopy-derive/src/util.rs b/zerocopy/zerocopy-derive/src/util.rs
index 7af578d523..933b7b3e67 100644
--- a/zerocopy/zerocopy-derive/src/util.rs
+++ b/zerocopy/zerocopy-derive/src/util.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-2-Clause OR Apache-2.0 OR MIT
+//
 // Copyright 2019 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0