The computer registration process for iTunes relies on a process whereby a user is required to key into the computer the correct Apple ID and password he or she used to purchase the song. iTunes have apparently not made moves to patent this, apparently because a patent is already held for this technology. Seemingly, Apple has been in negotiations with Pat-rights for some time, at least according to Joseph J. Zito, the patent lawyer representing Pat-rights.
"We expect to be successful in licensing negotiations with Apple. They're a good company that understands intellectual-property rights, and we think they'll be reasonable. My client was first in touch with Apple during the months of December and January, so Apple has been aware of the issue for a couple of months." - Joseph J. Zito.