Loading patent…
AssigneeHitachi, Ltd.
InventorsHiroshi Yoshiura, Kazuo Takaragi, Ryoichi Sasaki, Seiichi Susaki, Hisashi Toyoshima, Tsukasa Saito
Estimating the term…
This invention provides a method for identifying a purchaser who purchased content from which an illegal copy was produced. A provider system encrypts a content purchased by the purchaser using a public key of a purchaser system and sends the encrypted content to the purchaser system. The purchaser system creates a digital signature of the content with the use of a private key of its own and embeds the created digital signature into the received content. When an illegal copy is found, the provider system verifies the digital signature, embedded in the illegal copy as a digital watermark, to identify the purchaser who purchased the content from which the illegal copy was produced.
An embed-in-content information processing method for embedding information on k (k is an integer equal to or larger than 2) content-handling persons using an electronic computer, the method comprising the steps of:
In a system in which at least one client terminal, at least one Worldwide Web (WWW) server providing information upon request from said client terminal, and at least one mark management server managing one or more marks used by said client terminal, said client terminal, said WWW server and said mark management server are interconnected over a communication network, a Web page authentication method, for a Web page published on the WWW server, the method comprising:
In a system in which at least one client terminal, at least one Worldwide Web (WWW) server providing information upon request from said client terminal, and at least one mark management server managing one or more marks used by said client terminal, said client terminal, said WWW server and said mark management server are interconnected over a communication network, a Web page authentication method, for a Web page published on the WWW server, the method comprising:
A Web page authentication system comprising:
An information browser device for browsing a Web page, comprising:
A mark manager device for managing a mark for authenticating a Web page, comprising:
An information publisher device for publishing a Web page, comprising:
A recording medium storing a program therein for constructing an information browser device for browsing a Web page on a computer, wherein said program is read and executed by the computer to construct, on the computer:
A recording medium storing a program therein for constructing a mark manager device for managing a mark for authenticating a Web page on a computer, wherein said program is read and executed by the computer to construct, on the computer:
A recording medium storing a program therein for constructing an information publisher device for publishing a Web page on a computer, wherein said program is read and executed by the computer to construct, on the computer:
A Web page authentication system comprising:
An information browser device for browsing a Web page, comprising:
A mark manager device for generating a mark to be pasted on a Web page published by an information publisher device, comprising:
An information publisher device publishing a Web page, comprising:
A recording medium storing a program therein for constructing an information browser device for browsing a Web page on a computer said program being read and executed by the computer to construct, on the computer:
A recording medium storing a program therein for constructing a mark manager device for generating a mark to be pasted on a Web page published by an information publisher device on a computer, said program being read and executed by the computer to construct, on the computer:
Recording medium storing a program therein for constructing an information publishing device for publishing a Web page on a computer, said program being read and executed by the computer to construct, on the computer:
Dependencies are inferred from the claim text.