Patent ID: 7664951

Claim:
A transmitting apparatus comprising: input means for inputting data of a second program; encrypting means for encrypting said data inputted from said input means by use of a predetermined key; detecting means for detecting a position of an intra-picture from said data, wherein the position of the intra-picture is detected as a time offset and a byte offset from the beginning of a bit stream, wherein the time offset and the byte offset are encrypted with said data; first transmitting means for transmitting data of a first program and data of the second program encrypted by said encrypting means; second transmitting means for transmitting said key at a time for enabling said second program to be viewed on a receiving apparatus at a viewing time established by the transmitting apparatus, wherein said first program is viewed at a time when said data of said first program is received by said receiving apparatus, wherein said second program is viewed at a time when said key is received by said receiving apparatus and after a predetermined time slot when the data of said second program is transmitted, and wherein said first program and said second program are viewed in the same viewing time slot.