<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
EP1955545(A4)
申请公布日期
2013.11.13
申请号
EP20060848950
申请日期
2006.11.28
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