diff --git a/LICENSE b/LICENSE
index 775acfc..72f978a 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,2 @@
-All the files in this repository, except wcs.py and on-target-*/mbed*, are:
-
-Copyright Manuel Pégourié-Gonnard.
-All rights reserved.
+Unless specifically indicated otherwise in a file, files are licensed
+under the Apache 2.0 license, as can be found in apache-2.0.txt.
diff --git a/apache-2.0.txt b/apache-2.0.txt
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/apache-2.0.txt
@@ -0,0 +1,202 @@
+
+                                 Apache License
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+
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diff --git a/bench.sh b/bench.sh
index 64fe245..ce1e131 100755
--- a/bench.sh
+++ b/bench.sh
@@ -2,6 +2,9 @@
 
 # Build and run the on-host benchmark program.
 # (See also: on-target-benchmark directory.)
+#
+# Author: Manuel Pégourié-Gonnard.
+# SPDX-License-Identifier: Apache-2.0
 
 set -eu
 
diff --git a/benchmark.c b/benchmark.c
index b59de27..d870c11 100644
--- a/benchmark.c
+++ b/benchmark.c
@@ -1,6 +1,9 @@
 /*
  * On-host benchmark program. See bench.sh.
  * See also: on-target-bencmark.
+ *
+ * Author: Manuel Pégourié-Gonnard.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include <stdio.h>
diff --git a/consttime.sh b/consttime.sh
index 83edba2..4a35868 100755
--- a/consttime.sh
+++ b/consttime.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 # Check constant-time behaviour using MemSan and Valgrind.
+#
+# Author: Manuel Pégourié-Gonnard.
+# SPDX-License-Identifier: Apache-2.0
 
 set -eu
 
diff --git a/coverage.sh b/coverage.sh
index d3ce4dd..d718b81 100755
--- a/coverage.sh
+++ b/coverage.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 # Measure code coverage with open/closed-box testing using gcov/lcov.
+#
+# Author: Manuel Pégourié-Gonnard.
+# SPDX-License-Identifier: Apache-2.0
 
 set -eu
 
diff --git a/deps.sh b/deps.sh
index 21b2a71..f528f19 100755
--- a/deps.sh
+++ b/deps.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 # Print dependencies on libc / compiler's runtime, with sizes.
+#
+# Author: Manuel Pégourié-Gonnard.
+# SPDX-License-Identifier: Apache-2.0
 
 set -eu
 
diff --git a/entry.c b/entry.c
index 5219759..5359109 100644
--- a/entry.c
+++ b/entry.c
@@ -1,5 +1,8 @@
 /*
  * See deps.sh - this provides an entry point for the linker.
+ *
+ * Author: Manuel Pégourié-Gonnard.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "p256-m.h"
diff --git a/gen-test-data.py b/gen-test-data.py
index f0b7be3..8d6edb4 100644
--- a/gen-test-data.py
+++ b/gen-test-data.py
@@ -1,5 +1,8 @@
 #!/usr/bin/python3
 # coding: utf-8
+#
+# Author: Manuel Pégourié-Gonnard.
+# SPDX-License-Identifier: Apache-2.0
 
 """Generate test data for P-256 and related functions."""
 
diff --git a/macros.sh b/macros.sh
index ef40e9d..2f00596 100755
--- a/macros.sh
+++ b/macros.sh
@@ -2,6 +2,9 @@
 
 # Print the values of pre-defined macros of interest on a selection of cores.
 # This is a development helper to investigate how to detect cores/features.
+#
+# Author: Manuel Pégourié-Gonnard.
+# SPDX-License-Identifier: Apache-2.0
 
 set -eu
 
diff --git a/p256-m.c b/p256-m.c
index a37687c..28b85cb 100644
--- a/p256-m.c
+++ b/p256-m.c
@@ -1,9 +1,8 @@
 /*
  * Implementation of curve P-256 (ECDH and ECDSA)
- */
-/*
- * Copyright Manuel Pégourié-Gonnard.
- * All rights reserved.
+ *
+ * Author: Manuel Pégourié-Gonnard.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "p256-m.h"
diff --git a/p256-m.h b/p256-m.h
index 20df8ee..f455cf1 100644
--- a/p256-m.h
+++ b/p256-m.h
@@ -1,9 +1,8 @@
 /*
  * Interface of curve P-256 (ECDH and ECDSA)
- */
-/*
- * Copyright Manuel Pégourié-Gonnard.
- * All rights reserved.
+ *
+ * Author: Manuel Pégourié-Gonnard.
+ * SPDX-License-Identifier: Apache-2.0
  */
 #ifndef P256_M_H
 #define P256_M_H
diff --git a/p256.py b/p256.py
index 8686bcb..37f6f0c 100644
--- a/p256.py
+++ b/p256.py
@@ -1,5 +1,8 @@
 #!/usr/bin/python3
 # coding: utf-8
+#
+# Author: Manuel Pégourié-Gonnard.
+# SPDX-License-Identifier: Apache-2.0
 
 """A simple implementation of P-256 (ECDH, ECDSA) for tests."""
 
diff --git a/prof-g.sh b/prof-g.sh
index b20d103..6f76481 100755
--- a/prof-g.sh
+++ b/prof-g.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 # On-host profiling using Gprof
+#
+# Author: Manuel Pégourié-Gonnard.
+# SPDX-License-Identifier: Apache-2.0
 
 set -eu
 
diff --git a/prof-gpt.sh b/prof-gpt.sh
index c17041d..45a78bb 100755
--- a/prof-gpt.sh
+++ b/prof-gpt.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 # On-host profiling using gperftools
+#
+# Author: Manuel Pégourié-Gonnard.
+# SPDX-License-Identifier: Apache-2.0
 
 set -eu
 
diff --git a/prof-vg.sh b/prof-vg.sh
index e375904..2f7849f 100755
--- a/prof-vg.sh
+++ b/prof-vg.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 # On-host profiling using Valgrind
+#
+# Author: Manuel Pégourié-Gonnard.
+# SPDX-License-Identifier: Apache-2.0
 
 set -eu
 
diff --git a/prof.c b/prof.c
index e0d5f9a..53b2d88 100644
--- a/prof.c
+++ b/prof.c
@@ -1,6 +1,9 @@
 /*
  * Dummy program for on-host profiling.
  * See prof-vg.sh, prof-g.sh, prof-gpt.sh
+ *
+ * Author: Manuel Pégourié-Gonnard.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include <stdlib.h>
diff --git a/sizes.sh b/sizes.sh
index 130e10a..28d7e10 100755
--- a/sizes.sh
+++ b/sizes.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 # Print the size of p256-m.o with GCC and Clang on selected cores.
+#
+# Author: Manuel Pégourié-Gonnard.
+# SPDX-License-Identifier: Apache-2.0
 
 set -eu
 
diff --git a/stack.sh b/stack.sh
index bb4f5e1..77b229d 100755
--- a/stack.sh
+++ b/stack.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 # Compute maximum stack usage on selected cores with GCC.
+#
+# Author: Manuel Pégourié-Gonnard.
+# SPDX-License-Identifier: Apache-2.0
 
 for CPU in m0 m4 a7; do
     echo "*** $CPU ***"
diff --git a/test-closedbox.c b/test-closedbox.c
index 08fe176..1003b36 100644
--- a/test-closedbox.c
+++ b/test-closedbox.c
@@ -4,6 +4,9 @@
  * - validate determinstic public functions against standard test vectors
  * - validate non-deterministic public functions against other functions
  * - exercise error cases that can be reached in a deterministic way
+ *
+ * Author: Manuel Pégourié-Gonnard.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "p256-m.h"
diff --git a/test-common.h b/test-common.h
index 1b51555..5a20887 100644
--- a/test-common.h
+++ b/test-common.h
@@ -1,5 +1,8 @@
 /*
  * Common macros for both test-closedbox.c and test-openbox.c.
+ *
+ * Author: Manuel Pégourié-Gonnard.
+ * SPDX-License-Identifier: Apache-2.0
  */
 #if defined(TEST_VERBOSE)
 #define PUTS    puts
diff --git a/test-openbox.c b/test-openbox.c
index dbfc8af..9e90438 100644
--- a/test-openbox.c
+++ b/test-openbox.c
@@ -3,6 +3,9 @@
  *
  * - unit-tests for static functions (by including the C file)
  * - tests using a fixed RNG (and knowledge of how it's used)
+ *
+ * Author: Manuel Pégourié-Gonnard.
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "p256-m.c"
diff --git a/toolchain-mul64.c b/toolchain-mul64.c
index d4c2e0e..7690006 100644
--- a/toolchain-mul64.c
+++ b/toolchain-mul64.c
@@ -1,5 +1,8 @@
 /*
  * See toolchain-mul64.sh.
+ *
+ * Author: Manuel Pégourié-Gonnard.
+ * SPDX-License-Identifier: Apache-2.0
  */
 #include <stdint.h>
 
diff --git a/toolchain-mul64.sh b/toolchain-mul64.sh
index 3f6b80a..1ff3543 100755
--- a/toolchain-mul64.sh
+++ b/toolchain-mul64.sh
@@ -5,6 +5,9 @@
 # This is a development helper to:
 # 1. Check it the toolchain-provided __aeabi_lmul is contant-time (it isn't).
 # 2. Check if the compiler uses the UMAAL instruction (it doesn't).
+#
+# Author: Manuel Pégourié-Gonnard.
+# SPDX-License-Identifier: Apache-2.0
 
 set -eu