added copyright, license mention and other #10x2linus stuff.

README.md

@@ -114,4 +114,13 @@ Secret key encryption and signing/verifying uses Edwards curves 25519 algorithms
   - SHA3 256, 384, more are on the way.
 - CRC-protected binary ID with magic numbers to implement human-friendly IDS with type checks
 
+## Licensing
 
+# Licensing
+
+This is work in progress, not yet moved to public domain;
+you need to obtain a license from https://8-rays.dev or [Sergey Chernov]. For open source projects it will most be free on some special terms.
+
+It will be moved to open source; we also guarantee that it will be moved to open source immediately if the software export restrictions will be lifted. We do not support such practices here at 8-rays.dev and assume open source must be open.
+
+[Sergey Chernov]: https://t.me/real_sergeych