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US 2004/0107347 A1Published application
Content distribution system, content distribution method and terminal device
AssigneeSony Corporation
InventorAkira Ogino
Life of this patent
Estimating the term…
Abstract
A content distribution system, a content distribution method and a terminal device are capable of effectively preventing disadvantages of users who formally bought content. In the content system in which a distribution server and a terminal device are connected through a network, even content is taken out from a storage means of the terminal device to the outside later, the content always carries user identification information, so that even the user having the content distributes the content over the network illegally, the distributor of the content can be found with sure.
Claims9
A content distribution system composed by connecting a distribution server and a terminal device through a network, wherein
- said distribution server comprises:
- embedding means for converting user identification information and a storage definition flag into watermark information through prescribed spreading modulation and embedding the watermark information in content, the user identification information uniquely assigned to said terminal device, the storage definition flag indicating its state previously set on said terminal device side;
- encryption means for performing prescribed encryption on said content having said watermark information embedded therein;
- and
- transmitting means for transmitting said content encrypted, to said terminal device through said network, and
- said terminal device comprises:
- reception means for receiving said content;
- extraction means for extracting said user identification information and said storage definition flag by performing prescribed processing on said watermark information embedded in said content;
- decryption means for decrypting said encryption of said content depending on the existence of said user identification information;
- judgement means for judging based on the state of said storage definition flag whether said content decrypted should be encrypted before being stored;
- and
- storage means for storing said content having said watermark information embedded therein.
9 more elements
A content distribution method of a content distribution system composed by connecting a distribution server and a terminal device through the network, wherein:
- said distribution server comprises:
- a first step of converting user identification information and a storage definition flag into watermark information through prescribed spreading modulation and embedding said watermark information in content, the user identification information uniquely assigned to said terminal device, the storage definition flag indicating its state previously set on said terminal device side;
- a second step of performing prescribed encryption on said content having said watermark information embedded therein;
- and
- a third step of transmitting said content encrypted, to said terminal device through said network, and
- said terminal device comprises:
- a fourth step of receiving said content;
- a fifth step of extracting said user identification information and said storage definition flag by performing prescribed processing on said watermark information embedded in said content;
- a sixth step of decrypting said encryption of said content depending on the existence of said user identification information;
- a seventh step of judging based on the state of said storage definition flag whether said content decrypted should be encrypted before being stored;
- and
- an eighth step of storing said content having said watermark information embedded therein.
9 more elements
A content distribution method of a content distribution system composed by connecting a distribution server and a terminal device through a network, wherein:
- said distribution server comprises:
- a first step of adding user identification information and a storage definition flag to content, the user identification information uniquely assigned to said terminal device, the storage definition flag indicating its state previously set on said terminal device side;
- a second step of performing prescribed encryption on said content having said user identification information and said storage definition flag added thereto;
- and
- a third step of transmitting said content encrypted, to said terminal device through said network, and
- said terminal device comprises:
- a fourth step of receiving said content;
- a fifth step of extracting said user identification information and said storage definition flag from said content;
- a sixth step of decrypting said encryption of said content depending on the existence of said user identification information;
- a seventh step of judging based on the validly of said user identification information whether said user identification information should be converted into watermark information through prescribed spreading modulation and then the watermark information should be embedded in said content;
- an eighth step of judging based on the state of said storage definition flag whether said content decrypted should be encrypted before being stored;
- and
- a ninth step of storing said content having said watermark information embedded therein.
10 more elements
A content distribution method of a content distribution system composed by connecting a distribution server and a terminal device through a network, wherein:
- said distribution server comprises:
- a first step of adding user identification information and a storage definition flag to content, the user identification information uniquely assigned to said terminal device, the storage definition flag indicating its state previously set on said terminal device side;
- a second step of performing prescribed encryption on said content having said user identification information and said storage definition flag added thereto;
- and
- a third step of transmitting said content encrypted, to said terminal device through said network, and
- said terminal device comprises:
- a fourth step of receiving and storing said content in prescribed storage means;
- a fifth step of, when said content is read from said storage means as required, extracting said user identification information and said storage definition flag from the content;
- a sixth step of decrypting said encryption of said content depending on the existence of said user identification information;
- a seventh step of converting said user identification information into watermark information through prescribed spreading modulation and embedding the watermark information in said content decrypted;
- an eighth step of storing said content having said watermark information embedded therein, in said storage means.
8 more elements
A terminal device for managing content, comprises
- extraction means for, when watermark information generated by performing prescribed spreading modulation on user identification information and a storage definition flag is embedded in content, extracting said user identification information and said storage definition flag by performing prescribed processing on said watermark information embedded in said content, the user identification information uniquely assigned to said terminal device, the storage definition flag indicating its state previously set on said terminal device side;
- decryption means for, when said content has been encrypted, decrypting the encryption of the content depending on the existence of said user identification information;
- judgement means for judging based on the state of said storage definition flag whether said content decrypted should be encrypted before being stored;
- and
- storage means for storing said content having said watermark information embedded therein.
2 more elements
Dependencies are inferred from the claim text.