Copyright is a total can of worms, epsecially in todays internet world, and often the only way or resolving? copyright issues would be the court but of course which court! The court is also a can of worms cos internet is all over the world and things pass so quickly and evidence can just disappear or be tampered with, it would be a brave person to take this on I think.
If the music industry cant resolve copyright within their own backyard, the odd quote of/from a poem is unlikely to ever be resolved and Yahoo are just playing the nanny state game and trying to cover their backs by just banning everything,,,,,,,,,,,,,,,,,,best stick to genetics on Purrs I reckon