accemic · accemic · Jun 5, 2026 · Jun 5, 2026
diff --git a/LICENSE b/LICENSE
@@ -0,0 +1,23 @@
+ISC License
+
+Scope: This license covers the software and supporting material in this
+repository — including the tooling under tools/, the example material
+under examples/ (with its build sources), and the repository's build and
+documentation files (e.g. Makefile, README.adoc). It does NOT cover the
+CTXP specification under spec/, which is licensed separately under the
+Creative Commons Attribution 4.0 International License (CC BY 4.0). See
+spec/tn-ctxp-format.adoc and https://creativecommons.org/licenses/by/4.0/.
+
+Copyright (c) 2026 Accemic Technologies GmbH
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
diff --git a/Makefile b/Makefile
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: ISC
+# SPDX-FileCopyrightText: 2026 Accemic Technologies GmbH
+
 .PHONY: lint
 .PHONY: examples-build examples-build-docker examples-clean
 .PHONY: examples-verify

diff --git a/README.adoc b/README.adoc
@@ -87,7 +87,11 @@ If you want to evaluate or integrate CTXP tooling, please contact us:
 
 == License / attribution / acknowledgement
 
-The CTXP technical note states it is licensed under
-Creative Commons Attribution 4.0 International (CC BY 4.0). See the spec for details.
+This repository uses two licenses:
+
+* *Specification* (`spec/`): the CTXP technical note is licensed under the
+Creative Commons Attribution 4.0 International License (CC BY 4.0). See the spec for details.
+* *Tooling and examples* (`tools/`, `examples/`): licensed under the ISC License.
+See the `LICENSE` file at the repository root.
 
 The CTXP format was developed as part of the TRISTAN project, a European Union research initiative involving 46 partners to advance the RISC-V ecosystem. See https://tristan-project.eu/ for more information.
diff --git a/examples/_sources/Dockerfile b/examples/_sources/Dockerfile
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: ISC
+# SPDX-FileCopyrightText: 2026 Accemic Technologies GmbH
+
 FROM debian:bookworm-slim
 
 RUN apt-get update \

diff --git a/examples/_sources/Makefile b/examples/_sources/Makefile
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: ISC
+# SPDX-FileCopyrightText: 2026 Accemic Technologies GmbH
+
 RISCV_GCC ?= riscv64-unknown-elf-gcc
 RISCV_OBJDUMP ?= riscv64-unknown-elf-objdump
 

diff --git a/examples/_sources/basic.S b/examples/_sources/basic.S
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: ISC
+# SPDX-FileCopyrightText: 2026 Accemic Technologies GmbH
+
     .section .text
     .globl _start
 

diff --git a/examples/_sources/context.S b/examples/_sources/context.S
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: ISC
+# SPDX-FileCopyrightText: 2026 Accemic Technologies GmbH
+
     .section .text
     .globl _start
 

diff --git a/examples/_sources/daq.S b/examples/_sources/daq.S
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: ISC
+# SPDX-FileCopyrightText: 2026 Accemic Technologies GmbH
+
     .section .text
     .globl _start
 

diff --git a/examples/_sources/dualcore.S b/examples/_sources/dualcore.S
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: ISC
+# SPDX-FileCopyrightText: 2026 Accemic Technologies GmbH
+
     .section .text
     .globl _start
 

diff --git a/examples/_sources/interrupt_rfi.S b/examples/_sources/interrupt_rfi.S
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: ISC
+# SPDX-FileCopyrightText: 2026 Accemic Technologies GmbH
+
     .section .text
     .globl _start
 

diff --git a/examples/_sources/memory.S b/examples/_sources/memory.S
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: ISC
+# SPDX-FileCopyrightText: 2026 Accemic Technologies GmbH
+
     .section .text
     .globl _start
 

diff --git a/examples/_sources/overflow.S b/examples/_sources/overflow.S
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: ISC
+# SPDX-FileCopyrightText: 2026 Accemic Technologies GmbH
+
     .section .text
     .globl _start
 

diff --git a/tools/ctxp_lint.py b/tools/ctxp_lint.py
@@ -1,4 +1,6 @@
 #!/usr/bin/env python3
+# SPDX-License-Identifier: ISC
+# SPDX-FileCopyrightText: 2026 Accemic Technologies GmbH
 
 """CTXP (.ctxp.txt) linter
 

diff --git a/tools/verify_examples.py b/tools/verify_examples.py
@@ -1,4 +1,6 @@
 #!/usr/bin/env python3
+# SPDX-License-Identifier: ISC
+# SPDX-FileCopyrightText: 2026 Accemic Technologies GmbH
 
 """Verify that example CTXP traces look plausible with their corresponding disassembly.