Patent ID: 7254312
Filing Date: 2007-08-07
Classification: H04H,H04N

Abstract:
1. A digital transmitter, comprising: an encoder configured to encode a digital broadcast program: a first definer configured to define copy generation control information; a second definer configured to define retroactive view control information; a multiplexer configured to multiplex the digital broadcast program decoded by the encoder with the copy generation control information defined by the first definer and the retroactive view control information defined by the second definer; and a transmitter configured to transmit a signal multiplexed by the multiplexer, wherein the copy generation control information specifies one of the copy modes of “copy-freely”, “copy-once” and “copy-protected”, and wherein the retroactive view control information specifies a predetermined length time frame and allows a retroactive view operation by making a determination that a difference between a present time and a program start time is less than the predetermined length time frame, even if the transmitted copy generation control information is in the “copy-protected” mode.