Update: Andy sez, "Your 'NIN anti-piracy piss-take' story prompted me to send you this pic of the back of my CD, to see the fine-print my brother, Jeff, a lawyer (!) came up with: 'This CD is protected by plastic shrinkwrap.' We also considered:
Unauthorized duplication is prohibited by archaic unenforceable laws;
Unauthorized duplication is prohibited by inapplicable laws;
This CD is protected by plastic cellophane. Unauthorized duplication is expected;
Unauthorized duplication is a fact of life;
Unauthorized duplication happens."
Update 2: Karl sez, "I've always liked Ani Difranco's sentiment, which is printed on the packaging for all of her CDs: 'Unauthorized duplication, while sometimes necessary, is never as good as the real thing.'"
Update: Ben sez, "2 Live Crew's rap tapes used to carry the warning 'Unlawful duplication will get you fuck up by the Ghetto Style DJs.'"