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
Visual physician office systems and methods
Automated top-down multi-abstraction infrastructure performance analytics -network infrastructure-as-a-service perspective
Package for product
Moving structure and micro-mirror device using the same
Electronic device, information processing method, and storage medium
Authorization method for location based services
  Randomly Featured Patents
Low power VCC and temperature independent oscillator
Device for preventing thin apparatus from overturning
Method of transmitting TPC commands
Siphon adapter
Compact electrostatic comb actuator
Reading memory data
Streamlined buoyancy package for subsurface moorings
Animal pool with lift platform
Metal chelate-forming fiber, process for producing the same, method of trapping metal ion with the fiber, and metal chelate fiber
Display screen with graphical user interface