The Sixth Circuit, which has brought upon itself an avalanche of suits involving Bridgeport Music, just issued an interesting opinion involving Snoop Doggy Dog. The issue confronted was this: is someone who makes a sound recording of an allegedly infringing musical composition contributorily liable when others make covers of that musical composition without a (voluntary) license from defendant, and defendant receives royalties from the covers?
The Sixth Circuit affirmed a grant of summary judgment to defendant, also rejecting a duty to police infringements. Here's a link to the opinion. Here's a link to an article about Mr. Dogg's Doggy Biscuitz sneakers, of which I own.