发明名称 |
SELECTIVE ENCRYPTION TO ENABLE MULTIPLE DECRYPTION KEYS |
摘要 |
A selective encryption method and apparatus consistent with the invention duplicates selected packets in a file or data stream and multiple encrypts the packets using multiple encryption keys. Each encryption key is valid for a specific segment of time so that changes in entitlement keys used for decryption can be made without negatively impacting a customer's ability to access content that has been paid for. |
申请公布号 |
CA2437018(C) |
申请公布日期 |
2011.10.18 |
申请号 |
CA20032437018 |
申请日期 |
2003.08.12 |
申请人 |
SONY ELECTRONICS INC. |
发明人 |
CANDELORE, BRANT L. |
分类号 |
H04N21/2347;H04B1/66;H04L9/00;H04L9/14;H04N7/12;H04N7/167;H04N11/02;H04N11/04;H04N21/435 |
主分类号 |
H04N21/2347 |
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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