Controlling operation of a device using a re-configurable watermark detector
First Claim
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1. A method for controlling operation of a device using a watermark comprising:
- decoding a watermark embedded in a signal of a media type, where the watermark includes a command signal used to trigger a change in operation of the watermark detector;
based on the command signal, changing operation of the watermark detector, including changing how the watermark detector decodes or interprets a watermark in a signal of the media type;
after changing operation of the watermark detector, decoding a usage control restriction from a watermark embedded in the signal, wherein the watermark is perceptibly adapted to the signal such that the watermark is hidden in human perceptible portions of the signal and the usage control restriction controls transfer or copying of the signal in which the watermark is embedded.
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Abstract
The invention relates to methods, devices and systems for reconfiguring a watermark detector. In many applications, it is useful to be able to change the operation of a watermark detector. Such changes may include changing how the watermark detector decodes or interprets a watermark embedded in a signal of a given media type, such as audio, video or still images.
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Citations
31 Claims
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1. A method for controlling operation of a device using a watermark comprising:
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decoding a watermark embedded in a signal of a media type, where the watermark includes a command signal used to trigger a change in operation of the watermark detector;
based on the command signal, changing operation of the watermark detector, including changing how the watermark detector decodes or interprets a watermark in a signal of the media type;
after changing operation of the watermark detector, decoding a usage control restriction from a watermark embedded in the signal, wherein the watermark is perceptibly adapted to the signal such that the watermark is hidden in human perceptible portions of the signal and the usage control restriction controls transfer or copying of the signal in which the watermark is embedded. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
changing the operation of the watermark detector with data provided in a watermark payload.
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13. The method of claim 12 wherein the command signal comprises a one or more bit trigger in the watermark payload.
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14. The method of claim 12 wherein the data comprises a watermark key in the watermark payload.
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15. The method of claim 14 wherein the watermark key comprises pseudo-random key data.
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16. The method of claim 12 wherein successively-presented watermark payloads in the signal provide the data used to change the operation of the watermark detector.
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17. A method for controlling operation of a device using a watermark detector comprising:
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receiving a media object and a command associated with the media object signaling that the watermark detector requires an upgrade to decode a watermark from the media object;
in response to the command, updating the watermark detector to create an updated watermark detector; and
decoding the watermark from the media object with the updated watermark detector including decoding a usage control restriction from the watermark. - View Dependent Claims (18, 19, 20)
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21. A re-programmable watermark detector comprising:
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a watermark decoder for detecting a command to upgrade the detector; and
detector instructionsdetector instructions that are replaceable in response to detecting the command to upgrade the detector, the detector instructions being operable to decode a usage control restriction from a watermark and control playback or recording of a media object carrying the watermark;
wherein the detector instructions control decoding of watermarks embedded in media signals and are replaceable with a different set of instructions for controlling decoding of watermarks in response to the command to upgrade the detector.- View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. A method of encoding an upgrade trigger in a watermark comprising:
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receiving a media object of a given media type;
encoding a watermark into the media object, where the watermark includes a command signal used to trigger a change in operation of a watermark detector, the change being operable to change how the watermark detector decodes or interprets a watermark in a signal of the media type; and
encoding a usage control restriction into the watermark, wherein the change in the operation of the detector enables the watermark detector to read the usage control restriction, wherein the watermark is perceptibly adapted to the signal such that the watermark is hidden in human perceptible portions of the signal. - View Dependent Claims (29, 30, 31)
transmitting the encoded media object to one or more watermark detectors from a location remote to the one or more watermark detectors.
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Specification