diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..7807082
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,22 @@
+Copyright (c) 2026 BlackMark. All rights reserved.
+
+This repository and all of its contents (source code, documentation and images) are published for viewing
+and evaluation only. This is not open-source software.
+
+You may:
+  - read the contents, and
+  - download a copy and run it, unmodified, on your own systems, solely for your own private,
+    non-commercial evaluation of the software.
+
+No other rights are granted. Except as permitted above, you may not copy, modify, merge, translate,
+publish, distribute, sublicense, sell, host or otherwise make available, or use any part of the contents,
+in source or any other form, including as part of other software, without prior written permission from
+the copyright holder. A copy downloaded for evaluation must be deleted when the evaluation ends.
+
+Third-party packages installed from requirements.txt are not part of this repository and are covered by
+their own licenses.
+
+THE CONTENTS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
+LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
+EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY ARISING FROM, OUT OF
+OR IN CONNECTION WITH THE CONTENTS OR THEIR USE.
diff --git a/README.md b/README.md
index 8fb3837..624492a 100644
--- a/README.md
+++ b/README.md
@@ -107,3 +107,8 @@ python -m app.web                                    # http://127.0.0.1:5000
   invoice number prefix, colour theme) and their rooms (`room`) are set up directly in the database; everything
   else is entered in the app. Logos and photos for the invoice header go into `app/static/invoice/`, named in
   `unit.logo` / `unit.photo`.
+
+## License
+
+All rights reserved. This is not open-source software: the code is published to be read, and to be run
+unmodified for your own private evaluation — nothing else. See [LICENSE](LICENSE).