In order to enable a home network to deal with an AV content of digital broadcasting, etc., a measure for copyright protection on a network is necessary. In the digital broadcasting, a content protection rule is prescribed under a broadcasting operation rule of the ARIB (Association of Radio Industries and Businesses), and for dealing with the digital broadcasting in the home network, it is necessary to conform to a standard thereof.
When recording video image data with a copyright protection technique on IEEE1394 which is a representative digital network connecting digital AV apparatuses, it is normal to perform real-time transmission of MPEG2-TS. In addition, when recording on HDD on LAN, there exist various methods such as streaming or transfer by a file, however, a measure for copy right protection has been fragile. However, a technique called DTCP-IP (Digital Transmission Content Protection over Internet Protocol) is established recently, and streaming and transfer of a file is possible through a LAN by strictly taking in a copyright protection technique. Moreover, DLNA (Digital Living Network Alliance) which is a technical specifications for interconnecting an AV apparatus, a personal computer, and home information appliances using a home LAN (home network) and utilizing in association therewith is formulated, and a DLNA-compliant apparatus is available from other apparatus automatically only by connecting with a network, thus capable of transmitting/receiving a content.
However, an apparatus which is not compliant with the DLNA, for example, has not come to be able to record a video image with a high image quality received by a digital TV device on an HDD through a LAN. As a technique that enables transmission and reception of AV data in different formats by protecting copyright, there is one in which either of a packet generated by packetization processing means or a packet made to be used in Ethernet (registered trademark) without using a transfer protocol on an IP is transmitted or received (Japanese Laid-Open Patent Publication No. 2004-193791).
In addition, recently, it is possible to view a video image through a LAN in IP broadcasting on television, however, since a technique for recording by applying strict copyright protection technique even when recording the MPEG2-TS received by the IP broadcasting is not established, it is possible to record through the IEEE 1394 easily.