Jay-Z on Biting Biggie's Rhymes

Rap Genius also did a literary/legal analysis of Jay-Z’s alleged “fair use” — the shady part is, Jay doesn’t stick to biting well-known lines, but sometimes goes after obscurities (a tell-tale sign of attempted forgery).

Then again, isn’t hip-hop like China? Does intellectual property really exist in a genre based on allusion, sampling, etc.?