Data playback apparatus and method
OwnerSatoshi Kitaniinventor
Life of this patent
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Abstract
A data playback apparatus for playing back a recording medium in which a signal having digital watermark information embedded therein is recorded, the digital watermark information including copy control information, includes a reading unit, a signal detection unit, and a digital watermark information detection unit. The reading unit reads a signal from the recording medium. The signal detection unit determines whether or not the signal read by the reading means is the signal having digital watermark information embedded therein. When the start of the signal having digital watermark information embedded therein is detected by the signal detection unit, the digital watermark information detection unit detects the digital watermark information using the detected start as a trigger.
Claims22
A data playback apparatus for playing back a recording medium in which a signal having digital watermark information embedded therein is recorded, the digital watermark information including copy control information, the data playback apparatus comprising:
- reading means for reading a signal from the recording medium;
- signal detection means for determining whether or not the signal read by the reading means is the signal having digital watermark information embedded therein;
- and
- digital watermark information detection means for detecting the digital watermark information when the start of the signal having digital watermark information embedded therein is detected by the signal detection means.
A data playback apparatus for playing back a recording medium in which a signal having digital watermark information embedded therein is recorded, the digital watermark information including copy control information, the data playback apparatus comprising:
- signal detection means for determining whether or not a signal read from the recording medium is a video or audio signal;
- digital watermark information detection means for detecting the digital watermark information from the signal when a video or audio signal is detected by the signal detection means;
- and
- restriction means for prohibiting or restricting outputting or transferring the video or audio signal based on the copy control information included in the detected digital watermark information.
A data playback method of reading and playing back data from a recording medium in which a signal having digital watermark information embedded therein is recorded, the digital watermark information including copy control information, the data playback method comprising:
- a reading step of reading a signal from the recording medium;
- a signal detecting step of determining whether or not the read signal is the signal having digital watermark information embedded therein;
- and
- a digital watermark information detecting step of detecting the digital watermark information when the start of the signal having digital watermark information embedded therein is detected in the signal detecting step.
A data playback method of playing back a recording medium in which a signal having digital watermark information embedded therein is recorded, the digital watermark information including copy control information, the data playback method comprising:
- a signal detecting step of determining whether or not a signal read from the recording medium is a video or audio signal;
- a digital watermark information detecting step of detecting the digital watermark information from the signal when a video or audio signal is detected in the signal detecting step;
- and
- a restricting step of prohibiting or restricting outputting or transferring the video or audio signal based on the copy control information included in the detected digital watermark information.
Dependencies are inferred from the claim text.