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
Engine RPM control device
Watch chain
Hydrogenolysis of ethyl acetate in alcohol separation processes
Multi-room user interface
Writing implement
Gas flow indicator
Bootstrap gate driver
  Randomly Featured Patents
Mass spectrometer
Bill validator having a magnetic read head with pressurizing device
Method and apparatus in a communication network for switching messages to communication terminal equipment
Method and system of processing image signals
Packaging of polygonal section made of a sheet-type material and blank for producing such a packaging
Flexible surgical razor
Method of manufacturing a fibre-reinforced part for a wind power plant
Electrically powered foldable outer rearview mirror for a motor vehicle
Steel laminate gasket with main and auxiliary sealing devices
Integrated injection logic circuit having reduced delay