Patent ID: 7317796

Claim:
A system of video stream encryption, comprising: a storage device capable of storing a first quantization scale and a second quantization scale, wherein the first quantization scale is greater than the second quantization scale; and an encryption application coupled to the storage device, configured to receive video data, the first quantization scale and the second quantization scale, generate quantized data by a first equation, generate supplementary data by a second equation, generate quantized supplementary data by a third equation, encode and encrypt the quantized supplementary data using variable length encoding and symmetrical/asymmetrical encryption algorithm, wherein the first equation is represented by D q =V/Q 1 , the second equation is represented by D s =V −(V/Q 1 )×Q 1 , the third equation is represented by D qs =Ds/Q2, D q represents the quantized data, V represents the video, Q 1 represents the first quantization scale, D s represents the supplementary data, D qs represents the quantized supplementary data, and Q 2 represents the second quantization.