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 water-marking 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.
Claims16
In a method of distributing content in plural fragments, each fragment being no longer than a given maximum fragment length, comprising:
- watermarking the content, in which watermarking the content comprises watermarking a given payload symbol from a given alphabet in a first segment of the content and watermarking a given payload symbol from the given alphabet in a second segment of the content;
- and
- fragmenting the watermarked content in a plurality of fragments;
- Wherein the first segment and the second segment are spaced apart by an intermediary third segment, in which the length of this intermediary third segment is substantially equal to or greater than the maximum fragment length.
A method of detecting a payload symbol from a given alphabet in a portion content of a given length, the payload symbol having been watermarked in a segment of the content, which symbol is preceded or followed by a distinctive intermediary segment, the length of this intermediary segment being substantially equal to or longer than the maximum possible length of the portion, comprising, upon detection of the intermediary segment in the portion, initiating a detection of a payload symbol on a further portion of the content starting directly after the end or ending directly before the start of the intermediary segment.
A system for distributing content in plural fragments, each fragment being no longer than a given maximum fragment length, comprising:
- A preprocessor arranged to watermark the content, in which watermarking the content comprises watermarking a given payload symbol from a given alphabet in a first segment of the content and watermarking a given payload symbol from the given alphabet in a second segment of the content;
- and
- A divider arranged to divide the content in to a plurality of fragments,
- Wherein the preprocessor is arranged to watermark the content such that the first segment and the second segment are spaced apart by an intermediary third segment, in which the length of this intermediary third segment is substantially equal to or greater than the maximum fragment length.
A detector for detection of a payload symbol from a given alphabet in a portion content of a given length, the payload symbol having been watermarked in a segment of the content, which symbol is preceded or followed by a distinctive intermediary segment, the length of this intermediary segment being substantially equal to or longer than the maximum possible length of the portion, the detector being configured to initiate, upon detection of the intermediary segment in the portion, a detection of a payload symbol on a further portion of the content starting directly after the end or ending directly before the start of the intermediary segment.
In a watermark embedding method, the use of an intermediary segment between two payload segments for the purpose of temporal or spatial alignment in a subsequent detection method.
Dependencies are inferred from the claim text.