Hierarchical watermarking of content that is distributed via a network
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United States of America Patent
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Oct 12, 2004
Grant Date -
N/A
app pub date -
Jan 10, 2000
filing date -
Jan 10, 2000
priority date (Note) -
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status (Latency Note)
Importance
Abstract
Content is distributed via a network. Hierarchical watermarks are embedded in the content to prevent unauthorized copying of the content. In particular, a first digital watermark is embedded by a content source prior to distributing content to an intermediary distributor. The first watermark identifies the content source and the distributor. Clients that request copies of the content from the distributor receive copies that have a second digital watermark embedded. The second digital watermark identifies the distributor and the client. This approach alleviates the burden placed on the content source to embed watermarks to each copy of the content that is distributed to clients.
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