发明名称 |
DIGITAL RIGHTS MANAGEMENT USING TRUSTED TIME |
摘要 |
<p>A method for monitoring time so that the use of protected content can be controlled includes receiving a trusted time value from a trusted authority external to a client device. When the client is no longer in communication with the trusted authority, the previously-received trusted time value is updated by use of the client's operating system counter so that a calculated trusted time value is derived for content license evaluation purposes.</p> |
申请公布号 |
KR20080069167(A) |
申请公布日期 |
2008.07.25 |
申请号 |
KR20087007678 |
申请日期 |
2008.03.28 |
申请人 |
SONY ELECTRONICS, INC.;SONY CORPORATION |
发明人 |
STROHWIG MARC E.;KAWAMOTO YOJI;NAGANO MOTOHIKO;CHAVANNE PIERRE;GOTO NORIFUMI;STEELE OSCAR H. III;SWENSON ERIC JOHN |
分类号 |
H04N7/167 |
主分类号 |
H04N7/167 |
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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