diff --git a/debian/copyright b/debian/copyright
index 59310f4..71105b1 100644
--- a/debian/copyright
+++ b/debian/copyright
@@ -21,6 +21,20 @@
        src/ltc/hashes/blake2s.c
 Copyright: 2012, Samuel Neves <sneves@dei.uc.pt>
 License: Apache-2.0 or CC0-1.0 or OpenSSL
+
+Files: src/ltc/stream/rabbit/rabbit.c
+Copyright: public domain
+License: public-domain
+ The library is free for all purposes without any express
+ guarantee it works. [..]
+ .
+ This Rabbit C source code was morphed fm the EU eSTREAM ECRYPT submission
+ and should run on any conforming C implementation (C90 or later). [..]
+ .
+ On October 6, 2008, Rabbit was "released into the public domain and
+ may be used freely for any purpose."
+  http://www.ecrypt.eu.org/stream/rabbitpf.html
+  https://web.archive.org/web/20090630021733/http://www.ecrypt.eu.org/stream/phorum/read.php?1,1244
 
 Files: debian/*
 Copyright: 2017, Lucas Kanashiro <kanashiro@debian.org>