One example is that instead of requiring users to spend hours uploading their songs to the company's servers, as Google and Amazon do, Apple could just scan a user's hard drives to see what songs they own and then provide them almost-instant streaming access to master recordings. The process is sometimes referred to as "scan and match".
* "at best". This income cannot be effectively tracked back and will probably just go into a "pool". How it gets paid out of the pool will be anyone's guess.
[Update: The dirty deal is done, June 6, 2011]
[ Update: Call it "Scan & Snatch", since the low-bit rate download is traded in for a high one, the users scanning of an illegal song confirms and bolsters his "snatch".]