Method and system for watermarking content prior to fragmenting
AssigneeCivolution B.V.
InventorsMehmet Utku Celik, Martijn Maas
Life of this patent
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Abstract
In a method of distributing content in plural fragments, each fragment being no longer than a given maximum fragment length, a method of watermarking the content prior to fragmenting the content into the plural fragments, comprising watermarking a given payload symbol from a given alphabet in a given segment of the content, and treating a segment prior to or following the given segment as an intermediary segment, the length of this intermediary segment being substantially equal to or greater than the maximum fragment length.
Claims10
A method, implemented in an encoder, of distributing watermarked content in plural fragments, by transcoding the fragments into a format suitable for distribution over a data transport medium, each fragment being no longer than a given maximum fragment length, comprising watermarking segments of the content, each segment being part of a watermarking period, in which watermarking the content comprises:
- watermarking a given payload symbol from a given alphabet in a first segment of the content in a first watermarking period;
- watermarking a given payload symbol from the given alphabet in a second segment of the content in a second watermarking period following the first watermarking period, the first segment and the second segment being spaced apart by an intermediary third segment, wherein a reference watermark having a value being different from any of the payload symbols in the alphabet is embedded into the intermediary third segment;
- and
- fragmenting the watermarked content in a plurality of fragments, the intermediary third segment having a length that is substantially equal to or greater than the maximum fragment length.
A system for distributing watermarked content in plural fragments, each fragment being no longer than a given maximum fragment length, comprising:
- a preprocessor that watermarks segments of the content, each segment being part of a watermarking period, in which watermarking the content comprises watermarking a given payload symbol from a given alphabet in a first segment of the content in a first watermarking period, and watermarking a given payload symbol from the given alphabet in a second segment of the content in a second watermarking period following the first watermarking period;
- and
- a divider that divides the content in to a plurality of fragments,
- wherein the preprocessor watermarks the content such that the first segment and the second segment are spaced apart by an intermediary third segment, the intermediary third segment having a length that is substantially equal to or greater than the maximum fragment length, wherein a reference watermark having a value being different from any of the payload symbols in the alphabet is embedded into the intermediary third segment.
A method of detecting a payload symbol from a given alphabet in a portion of watermarked content distributed in plural fragments, each fragment being no longer than a given maximum fragment length, and obtained for detection, the payload symbol having been watermarked in a segment of the content, which segment is preceded or followed by a distinctive intermediary segment, the intermediary segment having a length being substantially equal to or longer than a maximum fragment length, wherein a reference watermark having a value being different from any of the payload symbols in the alphabet is embedded into the intermediary segment, the method comprising,
- upon detection of the intermediary segment in the portion, initiating a detection of a payload symbol of the content starting directly after an end or ending directly before a start of the intermediary segment.
Dependencies are inferred from the claim text.