| 摘要 |
Provided is a content distribution method which allows a source device to safely distribute copyrighted content to a sink device in response to a request from the sink device as a trigger. The content distribution method includes a list transmission step S11, a content request step S12, and a content transfer step S13. In S11, a source device transmits metadata which includes a format identifier indicating that content is distributable under the specification of the HDCP and the URL of the content. In S12, a sink device makes a request for content identified by the URL after adding information necessary for authentication processing to the request. In S13, the source device creates an encryption key by performing the authentication processing on the sink device in accordance with the information necessary for the authentication processing, encrypts the content using the encryption key, and transfers the encrypted content to the sink device. |
| 主权项 |
1. A content distribution method in a system in which a source device for transmitting content and a sink device for reproducing the content are connected via a communication network, the content distribution method comprising:
transmitting metadata from the source device to the sink device, the metadata representing a list of content items held by the source device; receiving the metadata by the sink device, and requesting, by the sink device, a content item included in the list of content items represented by the metadata; transferring the content item requested by the sink device from the source device to the sink device; and receiving and reproducing, by the sink device, the content item transferred from the source device, wherein in the transmitting, the source device transmits the metadata which includes a format identifier and a uniform resource locator (URL) for a content item protected by a predetermined copyright protection technology, among the content items included in the list, the format identifier indicating that the content item is distributable under the copyright protection technology, the URL indicating a place where the content item is stored, in the receiving and requesting, the sink device makes a request for a content item identified by the URL, the request including information necessary for performing authentication processing, in the transferring, the source device creates an encryption key by performing the authentication processing on the sink device in accordance with the information necessary for performing the authentication processing, encrypts the content item requested by the sink device using the encryption key, and transfers the encrypted content item to the sink device, and in the receiving and reproducing, the sink device decrypts the encrypted content item transferred from the source device, using the encryption key created in the authentication processing by the source device, to reproduce a decrypted content item. |
