Packet transmitter apparatus

Abstract

A packet transmitter apparatus capable of transmitting, by use of widely utilized packets such as IP packets and the like, contents protected by content protection technologies such as DTCP and the like. There are included a transmission condition setting / managing part(404) for extracting, from received non-A / V data or A / V data, at least one of A / V data billing information, reproduction control information and copy control information and for producing, from the extracted information, encryption mode information indicative of an encryption mode that is a condition when A / V data are transmitted; an encrypted data producing part(406) for producing encrypted data by encrypting, based on a transmission condition as decided by a combination of input terminal information, data format information and attribute information, the received A / V data and further by adding, to the encrypted A / V data, an encryption information header based on the encryption mode information; and a packetizing part(403) for producing a packet by adding a packet header to the produced encrypted data.

Description

technical field [0001] The present invention relates to a packet transmission device that performs IP packetization of encrypted AV streams and transmits them with high quality using Ethernet (registered trademark) (wired LAN) such as IEEE802.3 and wireless LAN such as IEEE802.11. Background technique [0002] With the development of communication technology in recent years, various techniques for efficiently transmitting packets have been proposed (for example, refer to Patent Document 1). As one of them, conventionally, in general households, a digital playback tuner (tuner) and a DVHS video recorder are connected through an IEEE 1394 digital interface in a room, and MPEG-TS (Moving Picture Experts Group / Transport Stream) signal transmission. Wherein, when content protection such as Copy One Generation is applied to the playback content, in order to protect the content from being illegally copied, the content is encrypted and transmitted. A DTCP (Digital Transmission Co...

AI Technical Summary

Problems solved by technology

In the past DTCP method, in IEEE1394, although the real-time transmission of MPEG-TS signals can be realized by using synchronous packet transmission, there are the following major problems. The standard communication protocol of the Internet, that is, Internet Protocol (IP), cannot be used. (IEEE802.3), wireless LAN (IEEE802.11) and other networks that can transmit IP packets

[0012] That is, there is a big problem that content corresponding to digital copyright protection, such as terrestrial / BS digital broadcasting and server-based broadcasting, cannot be transmitted between a packet sending device and a packet receiving device logically connected by IP on the basis of copyright protection

[0013] In addition, in the transmission of live (live) playback, when using HTTP (HyperTextTransfer Protocol), whenever there is an HTTP request, it is necessary to calculate the header length and transmission content length attached to the encryption on the receiving side. to deal with heavier problems

[0014] In addition, there is a problem that it is difficult to simply implement special playback such as fast-forwarding, rewinding, and slow-motion of the content stored in the hard disk, etc.

[0015] In addition, there is a problem that it is difficult to simply use a common method to fast-forward, rewind, slow-play, etc. to play the contents of different storage formats stored in hard disks and optical discs, etc.

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