发明名称 |
ENCRYPTION AND CONTENT CONTROL IN A DIGITAL BROADCAST SYSTEM |
摘要 |
A selective encryption encoder has a packet identifier that identifies packets of a specified packet type forming a part of a program. A packet duplicator duplicates the identified packets to produce first and second sets of the identified packets. A PMT (program map table) inserter generates temporary identifying information that identifies the first and second sets of identified packets inserts the temporary identifying information as user private data in a program map table (PMT) forming a part of the transport program specific information (PSI). The data are then sent to and received from a primary encryption encoder to encrypt the first set of identified packets under a first encryption method. A secondary encrypter encrypts the second set of identified packets under a second encryption method. The PSI is then modified at a PSI modifier to remove the temporary identifying information and to correctly associate the first and second sets of identified packets and the unencrypted packets with the program. |
申请公布号 |
CA2413880(C) |
申请公布日期 |
2011.10.18 |
申请号 |
CA20022413880 |
申请日期 |
2002.12.10 |
申请人 |
SONY ELECTRONICS INC. |
发明人 |
PEDLOW, LEO M.,JR.;CANDELORE, BRANT L.;DEROVANESSIAN, HENRY |
分类号 |
H04N21/2347;H04L9/14;H04L29/08;H04N5/00;H04N7/16;H04N7/167;H04N7/24 |
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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