Patent ID: 8542829
Filing Date: 2013-09-24
Classification: H04L,H04N

Abstract:
1. A method performed by apparatus for transmitting video data, the method comprising the steps of: subjecting digital information data to enciphering process in such a manner as not to produce forbidden code for producing enciphered digital information data which do not contain any forbidden code, wherein said digital information data comprises a group of data including timing identification data in the form of forbidden codes which are not used as information codes for representing information, wherein said digital information data is contained in word sequence data which contain also time reference code data constituted with the timing identification codes in addition to the digital information data; producing enciphered word sequence data which include the enciphered digital information data and the time reference code data; and transmitting the enciphered word sequence data wherein the digital information data and one of pseudo-random number data and genuine random number data are subjected to operational process without producing forbidden code to produce the enciphered digital information data wherein the operational process to which the digital information data and one of the pseudo-random number data and the genuine random number data are subjected without producing the forbidden code, includes adding, subtracting and modulo operations relating to the digital information data and one of the pseudo-random number data and the genuine random number data, the operational process being performed with data representing the number of the forbidden codes arranged out of one side of the range of the information codes of the digital information data and data representing the number of the information codes of the digital information data, wherein the modulo operation obtains a remainder according to the number of the information codes of the digital information data, wherein, the adding, subtracting and modulo operations relating to the digital information data, is represented with an equation Ci={(Mi−N wherein Mi represents a code position number for each of the information codes of the digital information data, Ci represents a code position number for each of the information codes of the enciphered digital information data, Ei represents code position number for each of 10-bit code of the pseudo-random number data, N wherein the forbidden codes exclude video data and wherein the video data is in a high definition serial interface (HD-SDI) format.