MacRumors.com

With the first anniversary of Apple's iTunes Music Service approaching, Apple is facing some repeated attempts at hacks opening up the iTunes Music format.

Playfair and QTFairUse both provided rough applications to accomplish the task of stripping iTunes Digital Rights Management. Playfair was originally hosted at Sourceforge, but was reportedly shut down at Apple's request.

Sarovar was the next home for Playfair, but was also quickly removed at the request of Apple. From the cease and desist letter:

It was recently brought to our clients' attention that a program called
"PlayFair" had been developed, which decoded our clients' protected AAC
files, converting them to unencrypted files allowing them to be played and
distributed in an unrestricted manner. This is contrary to our clients'
terms and conditions governing availability of the service and is causing
them enormous potential loss of revenue and reputation. Not only that,
the PlayFair program is against the express provisions of our Information
Technology Act, 2000 and the Copyright Act, 1957 and you are equally
liable as accessories, being the means through which the offending program
is available for download at the Sarovar site at the following URL:
http://sarovar.org/projects/playfair/.

Update: Meanwhile, FairTunes offers the ability to decode protected into unprotected and uncompressed audio... but does not retain the unique ability of the other applications of converting from Protected AAC -> Unprotected AAC without any loss.