Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Method and device for controlling access to encrypted data










Image Number 3 for United States Patent #7908491.

The invention concerns a method for controlling access to encrypted data by control words (CW), said control words being received by a security module in control messages (ECM) and returned to a unit operating on (STB) the encrypted data. The method includes the following steps: receiving a first control message (ECM) comprising at least one control word (CW) and a time stamp (TS), receiving a second control message (ECM2) consecutive to the first control message (ECM1), said second message comprising at least one control word (CW) and a time stamp (TS), determining a duration corresponding to the difference between the time stamps (TS) of the two consecutive control messages (ECM1, ECM2), if said duration is less than a predefined duration (CP), incrementing an error counter (CE), and if said duration is not less than said predefined duration, decrementing said error counter (CE), returning the control word (CW) to the operating unit (STB) after a waiting time depending on the value of the error counter (CE).








 
 
  Recently Added Patents
Power conversion device
Medical devices having MRI compatible metal alloys
Ranking of items as a function of virtual shopping cart activity
Workflow based authorization for content access
Wall panel
Feed additive composition for ruminants, and feed containing the same, and method of fabricating such feed additive composition for ruminants
Wireless communication device that transmits geographic location information in router advertisement acknowledgement messages
  Randomly Featured Patents
High-speed multi-layer optical disc recording
Triple chamber bottle and method of manufacturing the same
Electronic control device for internal combustion engine
Foam encapsulated targets
Method and apparatus for distributing messages
Wiring substrate and manufacturing method thereof
Anti-pilferage ring tag
Transport and/or storage of acrylic acid
Output buffer circuit having low noise characteristics
Couplings for water fed poles