http://benji3up2kxewkqfcq7buxk2xd6zwy3zggnurkrm3l4cvwy2iipvyyad.onion/mirrors/gmpdoc/Copying.html
You
must make sure that they, too, receive or can get the source code. And you
must tell them their rights. Also, for our own protection, we must make certain that everyone finds out
that there is no warranty for the GNU MP library. If it is modified by
someone else and passed on, we want their recipients to know that what they
have is not what we distributed, so that any problems introduced by others
will not reflect on our reputation.