![]() ![]() ![]() ![]() ![]() Upon attempting to play a file, the master key stored within the file is then matched to the user key, and if successful, allows playing. When a user registers a new computer with iTunes, the device requests authorization from Apple's servers, thereby gaining a user key. The key required to decrypt the master key is called the "user key". The master key required to decrypt the audio layer is also stored in encrypted form in the MP4 container file. The layer is encrypted using the AES algorithm. In January 2009, Apple signed deals with all major record labels as well as many independent labels to offer all iTunes music with a DRM-free option.įairPlay-protected files are regular MP4 container files with an encrypted AAC audio layer. The restrictions imposed by FairPlay, mainly limited device compatibility, have sparked criticism, with a lawsuit alleging antitrust violation that was eventually closed in Apple's favor, and various successful efforts to remove the DRM protection from files, with Apple continually updating its software to counteract such projects. It is built into the MP4 multimedia file format as an encrypted AAC audio layer, and was used until April 2009 by the company to protect copyrighted works sold through iTunes Store, allowing only authorized devices to play the content. FairPlay is a digital rights management (DRM) technology developed by Apple Inc. ![]()
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