License FOG software and documentation

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+# FOG Licensing
+
+Copyright (C) 2026 Gab Virebent
+
+FOG uses separate recognised libre licenses for software and documentation.
+
+## Software
+
+Software source code, scripts, tests, build files, container definitions,
+machine-readable fixtures, and other implementation material are licensed
+under the GNU Affero General Public License, version 3 or any later version
+(`AGPL-3.0-or-later`), unless a file explicitly states another license.
+
+The complete version 3 license text is available at
+`LICENSES/AGPL-3.0-or-later.txt`.
+
+The current public repository does not contain a FOG protocol implementation
+or client SDK. This rule applies to software when it is published here; it
+does not claim that such software already exists.
+
+## Documentation
+
+Markdown documentation, protocol specifications, diagrams, and
+`merkle-tree.txt` are licensed under the Creative Commons
+Attribution-ShareAlike 4.0 International license (`CC-BY-SA-4.0`), unless a
+file explicitly states another license.
+
+The complete license text is available at
+`LICENSES/CC-BY-SA-4.0.txt`.
+
+## Scope and third-party material
+
+The license texts in `LICENSES/` retain their original terms. Third-party
+material, when present, retains its own stated license. No trademark rights
+are granted by these licenses.