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The Digital Audio Access Protocol (DAAP) is the proprietary protocol introduced by Apple in its iTunes software to share media across a local network. DAAP addresses the same problems for Apple as the UPnP AV standards address for members of the Digital Living Network Alliance (DLNA). == Description == The DAAP protocol was originally introduced in iTunes version 4.0.〔("Unofficial DAAP protocol documentation" ) by Daniel Garcia, retrieved December 2, 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. A DAAP server is a specialized HTTP server, which performs two functions. It sends a list of songs and it streams requested songs to clients. There are also provisions to notify the client of changes to the server. Requests are sent to the server by the client in form of URLs and are responded to with data in application/x-dmap-tagged mime-type, which can be converted to XML by the client. iTunes uses the ZeroConf (also known as Bonjour) service to announce and discover DAAP shares on a local subnet. The DAAP service uses TCP port 3689 by default.〔("Well Known Port Numbers" ) by ''IANA'', November 30, 2006, retrieved December 2, 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 port tunneling are possible). ''The Register'' speculates that Apple made this move in response to pressure from the record labels.〔("Apple halts iTunes' Internet sharing ability" ) by Tony Smith, ''The Register'', May 28, 2003, retrieved August 31, 2006〕 More recent versions of iTunes also limit the number of clients to 5 unique IP addresses within a 24-hour period. DAAP has also been implemented in other non-iTunes media applications such as Banshee, Amarok, Exaile (with a plugin), Songbird (with a plugin), Rhythmbox, and WiFiTunes. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Digital Audio Access Protocol」の詳細全文を読む スポンサード リンク
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