libtelnet 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@sourcemud.org>
-- Jack Kelly <endgame.dos@gmail.com>