diff --git a/AGENTS.md b/AGENTS.md
index b0eeaf77..f2146c34 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -4,7 +4,7 @@ Static recompilation of *Ocarina of Time* (Switch 2, ARM64, game version 1.1.1)
 
 ## Game content boundary
 
-This repository is public. Game data lives outside it and every derived file stays in ignored folders.
+This repository is private, and its additions are all rights reserved (`LICENSE-ADDITIONS`). It still never holds game data: game data lives outside it and every derived file stays in ignored folders.
 
 - The user's game and key paths are in `config.local.toml` (ignored). Pass the keys file path to tools; the tools read it themselves. Key values stay out of your output, logs, commands and files.
 - Everything extracted or generated goes under `build/` or `generated/`.
diff --git a/LICENSE-ADDITIONS b/LICENSE-ADDITIONS
new file mode 100644
index 00000000..a3ad1e9d
--- /dev/null
+++ b/LICENSE-ADDITIONS
@@ -0,0 +1,19 @@
+Copyright (c) 2026 chrg6. All rights reserved.
+
+This file covers the additions and changes made in this repository after its base import (the first commit of its
+history): new files, and the changed and added lines of existing files, as the commit history shows them.
+
+1. The base import stays under its MIT license (LICENSE). Third-party code stays under the licenses
+   THIRD_PARTY_NOTICES.md lists, with the notices those licenses require. Nothing here limits the rights those
+   licenses give to their parts.
+
+2. For the additions and changes, no license is granted. Without written permission from the copyright holder you may
+   not copy, modify, distribute, publish, sublicense or sell them, in whole or in part.
+
+3. In particular, no permission is granted to use any part of them to train, fine-tune, evaluate or prompt a machine
+   learning model, to build a dataset, or as input to an AI code-generation or code-review service, except by the
+   copyright holder.
+
+4. Access to the repository, whether by invitation or otherwise, does not grant any of the rights above.
+
+This notice is not legal advice; where a copy of this repository is shared, the copyright holder's written terms apply.
diff --git a/README.md b/README.md
index a2d539e2..8f84693d 100644
--- a/README.md
+++ b/README.md
@@ -47,8 +47,10 @@ Requirements: Windows 10 or later, an x86-64 CPU with SSE4.2 (AVX2/FMA machines
 
 ## License
 
-The project's own code is under the [MIT License](LICENSE); third-party code keeps its own license
-([THIRD_PARTY_NOTICES.md](THIRD_PARTY_NOTICES.md)). The license grants nothing for Nintendo's game.
+This repository is private. Its additions and changes are all rights reserved ([LICENSE-ADDITIONS](LICENSE-ADDITIONS)):
+no part of them may be copied, published, or used to train, fine-tune or prompt AI models or AI coding tools without
+written permission. The base import stays under its [MIT License](LICENSE), and third-party code keeps its own license
+([THIRD_PARTY_NOTICES.md](THIRD_PARTY_NOTICES.md)). No license grants anything for Nintendo's game.
 
 Ocarina Recomp is an independent, non-commercial fan project, not affiliated with or endorsed by Nintendo. *The Legend
 of Zelda*, *Ocarina of Time* and *Nintendo Switch* are trademarks of Nintendo.