example:
original text of the ISC license from 2000: https://source.isc.org/cgi-bin/gitweb.cgi?p=bind9.git;a=blob;f=COPYRIGHT;hb=ab26da0d8f7759a4db721ab7d6ba6351b2de1d01
commit in 2007 that changed it: https://source.isc.org/cgi-bin/gitweb.cgi?p=bind9.git;a=commitdiff;h=599a98b25ca10c501bdf3368eab2a2a951130949