Then every chain restaurant wouldn&#x27;t need to have their own, non-infringing Happy Birthday song...<p>One possibly crackpot theory that just occurred to me is that in the _Futurama_ universe, copyright was extended so far as to be perpetual[1]<p>[1] <a href="http:&#x2F;&#x2F;www.cc.com&#x2F;video-clips&#x2F;ubbd92&#x2F;futurama-nibbler-s-birthday" rel="nofollow">http:&#x2F;&#x2F;www.cc.com&#x2F;video-clips&#x2F;ubbd92&#x2F;futurama-nibbler-s-birt...</a>