Reproduction apparatus and reproduction method of digital video signal or audio signal
View Patent ↗A reproduction method and apparatus for reproducing video data and/or audio data from a recordable medium having video data and/or audio data recorded thereon. The video data and/or audio data is generated by superimposing information concerning an attribute of a video signal and/or an audio signal on a signal of digitized video data and/or a signal of digitized audio data. Information concerning a copyright superimposed on the video data and/or audio data is reproduced from the medium, and a type of the medium is identified. Reproduction is stopped in response to a determination that the medium is illegally produced, the determination being based on a combination of the information concerning a copyright which is reproduced and the type of the medium identified.
1. A reproduction apparatus for reproducing video data and/or audio data from a medium dedicated to reproduction or a recordable medium having video data and/or audio data recorded thereon, the video data and/or audio data being generated by superimposing information concerning an attribute of a video signal and/or an audio signal on a signal of digitized video data and/or a signal of digitized audio data, the reproduction apparatus comprising:
a reproducing circuit which reproduces the information concerning an attribute superimposed on the video data and/or audio data from the medium;
an identifying circuit which identifies a type of the medium as a medium dedicated to reproduction; and
a stopping circuit which stops reproduction in response to a determination that the medium is illegally produced, the determination being based on a combination of the information concerning an attribute reproduced by the reproducing circuit and the type of the medium identified by the identifying circuit as the medium dedicated to reproduction.
2. A reproduction apparatus according to claim 1 , wherein the information concerning an attribute of a video signal and/or an audio signal is superimposed on the digitized video signal and/or audio signal by digital watermarking.
3. A reproduction apparatus according to claim 2 , wherein the type of the medium is used to identify whether the medium is a copied medium dedicated to reproduction or not.
4. A reproduction apparatus according to claim 2 , wherein the superimposed information concerning an attribute of a video signal and/or an audio signal causes the quality of the reproduced video signal and/or audio signal to deteriorate if the superimposed information is altered.
5. A reproduction apparatus according to claim 2 , wherein the information concerning an attribute of a video signal and/or an audio signal is information concerning consent of copying.
6. A reproduction apparatus according to claim 1 , wherein the illegally produced medium is a duplicated medium dedicated to reproduction.
7. A reproduction method for reproducing video data and/or audio data from a medium dedicated to reproduction or a recordable medium having video data and/or audio data recorded thereon, the video data and/or audio data being generated by superimposing information concerning an attribute of a video signal and/or an audio signal on a signal of digitized video data and/or a signal of digitized audio data, comprising the steps of:
reproducing the information concerning an attribute superimposed on the video data and/or audio data from the medium;
identifying a type of the medium as a medium dedicated to reproduction; and
stopping reproduction in response to a determination that the medium is illegally produced, the determination being based on a combination of the information concerning an attribute reproduced by the reproducing step and the type of the medium identified by the identifying step as a medium dedicated to reproduction.
8. A reproduction method according to claim 7 , wherein the information concerning an attribute of a video signal and/or an audio signal is superimposed on the digitized video signal and/or audio signal by digital watermarking.