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
Digital display devices and digital projectors with expanded color gamut
Cosmetic product including vegetable oil blend
Reuse of static image data from prior image frames to reduce rasterization requirements
Method for assembling a camera module, and camera module
Personal IP toll-free number
Self-assembling surface coating
Probe for ultrasound diagnostic apparatus
  Randomly Featured Patents
Frictional gearing apparatus
Ion implanter
Terminal structure for outdoor luminaire
Sliding door assembly
Process for producing a desired breaking point on a glass body
Load monitoring system
Rotary drafting apparatus
Concrete pouring forms for uniting building units
Ear muff accessory for safety hard hat
Substituted aminomethyl-phenyl-cyclohexane derivatives