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DESCRIPTION The DAAP protocol was originally introduced in iTunes version 4.0. "Unofficial DAAP protocol documentation" by Daniel Garcia, retrieved December 02, 2006 Initially, Apple did not officially release a protocol description, but it has been reverse-engineered to a sufficient degree that reimplementations of the protocol for non-iTunes platforms have been possible. Recently, however, Apple has begun to license the protocol specification for commercial implementations. "Open DAAP forum" , retrieved December 02, 2006 A DAAP server is a specialized '', November 30, 2006, retrieved December 02, 2006 DAAP is one of two media sharing schemes that Apple has currently released. The other, Digital Photo Access Protocol (DPAP) , is used by IPhoto for sharing images. They both rely on an underlying protocol, Digital Media Access Protocol (DMAP) . Early versions of iTunes allowed users to connect to shares across the Internet, however, in recent versions only computers on the same subnet can share music (workarounds such as es within a 24 hour period. DAAP has also been implemented in other non-iTunes media applications such as Banshee , Amarok , Rhythmbox , and WiFiTunes . DAAP AUTHENTICATION Beginning with iTunes 4.2, Apple introduced authentication to DAAP sharing, meaning that the only clients that could connect to iTunes servers were other instances of iTunes. This was further modified in iTunes 4.5 to use a custom hashing algorithm, rather than the standard MD5 function used previously. Both authentication methods were successfully reverse engineered " iTunes 4.5 Authentication Cracked" , April 29, 2004, retrieved March 12, 2007 within months of release. With iTunes 7.0, a new 'Client-DAAP-Validation' header hash is needed when connecting to an iTunes 7.0 server. This does not affect 3rd party DAAP servers, but all current DAAP clients (including official iTunes before iTunes 7.0) will fail to connect to an iTunes 7.0 server, receiving a '403 Forbidden' HTTP error. The iTunes 7.0 authentication traffic analysis seem to indicate that a certificate exchange is performed to calculate the hash sent in the 'Client-DAAP-Validation' header. SEE ALSO EXTERNAL LINKS
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