Digital video copy protection system
AssigneeSony Corporation
InventorsKatsumi Tahara, Hideki Koyanagi, Yoichi Yagasaki, Yasushi Fujinami
Life of this patent
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Abstract
A formatting apparatus authenticates an information signal prior to mass duplication of the signal by analyzing the signal to detect the presence or absence of a security signal therein, inserting a security signal into the information signal, and recording the modified signal only if no security signal was detected.
Claims30
A formatting apparatus for the authentication and mass duplication of an information signal recorded on a storage medium, said apparatus comprising:
- first receiving means for receiving said information signal;
- second receiving means for receiving a key signal;
- key signal detection means, coupled to said first receiving means and to said second receiving means, for analyzing said information signal to detect whether or not a copy of said key signal is present in said information signal;
- key insertion means, coupled to said first receiving means and to said second receiving means, responsive to the detection by said key signal detection means that a copy of said key signal is not present in said information signal for selectively inserting into a portion of said information signal not normally allocated for copy protection information a copy of said key signal to produce a modified information signal;
- recording means, coupled to said key signal detection means and to said key insertion means, for recording said modified information signal if a copy of said key signal is not detected in said information signal;
- and
- means for inhibiting the recording of said information signal if a copy of said key signal is detected in said information signal.
A method for the authentication and mass duplication of an information signal recorded on a storage medium, said method comprising the steps of:
- receiving said information signal;
- receiving a key signal;
- analyzing said information signal to detect whether or not a copy of said key signal is present in said information signal;
- if a copy of said key signal is not present in said information signal, selectively inserting into a portion of said information signal not normally allocated for copy protection information a copy of said key signal to produce a modified information signal and recording said modified information signal;
- and
- if a copy of said key signal is present in said information signal inhibiting the recording of said information signal.
Dependencies are inferred from the claim text.