发明名称 |
Digital data authentication method |
摘要 |
This invention provides a method for identifying a purchaser who purchased content from which an illegal copy was produced. A provider system (100) encrypts a content purchased by the purchaser using a public key of a purchaser system (200) and sends the encrypted content to the purchaser system. The purchaser system 200 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 100 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. <IMAGE> |
申请公布号 |
EP0883284(A3) |
申请公布日期 |
2000.04.12 |
申请号 |
EP19980110336 |
申请日期 |
1998.06.05 |
申请人 |
HITACHI, LTD. |
发明人 |
YOSHIURA, HIROSHI;TAKARAGI, KAZUO;SASAKI, RYOICHI;SUSAKI, SEIICHI;TOYOSHIMA, HISASHI;SAITO, TSUKASA |
分类号 |
G06F21/10;G06T1/00;H04L29/06;H04N1/32;(IPC1-7):H04N1/32;H04L9/32 |
主分类号 |
G06F21/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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