SYSTEMS AND METHODS FOR DEVICE AUTHENTICATION INCLUDING TIMESTAMP VALIDATION
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United States of America Patent
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Issued Date -
Jan 3, 2013
app pub date -
Mar 31, 2012
filing date -
Jun 29, 2011
priority date (Note) -
Abandoned
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Abstract
Systems and methods for authenticating playback devices using timestamp validation in accordance with embodiments of the invention are disclosed. One embodiment includes measuring a time difference between the system clock and a clock on a remote server, retrieving at least one reference time difference from the playback device, where the reference time difference is stored in the playback device, determining whether the system clock of the playback device is valid by comparing the measured time difference to reference time difference, retrieving at least one timestamp when the measured time difference is valid, where each of the at least one timestamps is securely stored by the playback device in response to the occurrence of a predetermined event and is based on the current time of the system clock of the playback device when the predetermined event occurred, and determining whether the system clock is valid based upon the retrieved timestamp.
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