update/clarify public domain license in COPYING
diff --git a/COPYING b/COPYING
index d5d21ff..f95f22e 100644
--- a/COPYING
+++ b/COPYING
@@ -1 +1,10 @@
-Public Domain
+libtelnent is released to the public domain:
+
+The author or authors of this code dedicate any and all copyright
+interest in this code to the public domain. We make this dedication
+for the benefit of the public at large and to the detriment of our
+heirs and successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+code under copyright law.
+
+-- Sean Middleditch <sean@middleditch.us>