Resources Contact Us Home
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
Rear bumper for an automobile
Uplink interference mitigation method and apparatus
Simultaneous enhancement of transmission loss and absorption coefficient using activated cavities
Motion-compensated prediction of inter-layer residuals
Insulin derivative
Power supply system for motor vehicle
  Randomly Featured Patents
Golf-ball shaped ashtray
Aerial photography camera mount assembly for a helicopter
Expandable surgical implants and methods of using them
Adhesive- and fastener-free footing pad
System and method of sharing contents data in network
Process for hydroformylation
Process for purification of hydrocarbons using metal exchanged clinoptilolite to remove carbon dioxide
DC interating display driver employing pixel status memories
Identification of email forwarders
Rain cap system for fast modular structures