Visible watermark to protect media content from server to projector
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United States of America Patent
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Issued Date -
Oct 30, 2003
app pub date -
Apr 21, 2003
filing date -
Apr 29, 2002
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A visible first watermark and invisible second and third watermarks are embedded in digital media content, in order to protect the media content from piracy. The visible first watermark is embedded in and removed from the media content using a first watermark key. The invisible second and third watermarks are embedded in and removed from the media content using second and third watermark keys, respectively. The first, second and third watermark keys are all symmetric keys. A distribution entity embeds the visible first watermark in the media content using the first watermark key and embeds an invisible second watermark in the media content using the second watermark key. The distribution entity transmits the media content with the embedded visible first watermark and invisible second watermark to a displaying entity, wherein the displaying entity removes the visible first watermark from the media content using the first watermark key and embeds the invisible third watermark in the media content using the third watermark key.
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Family
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