Modifying bitstreams
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United States of America Patent
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Aug 7, 2012
Grant Date -
Mar 9, 2006
app pub date -
Feb 5, 2003
filing date -
Feb 6, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The bitstream includes digital codes representing an information signal. At least one digital code is selected. The code occupies a part of the bitstream which is to contain at least one watermark code which represents a watermark perceptible in the information signal. The selected digital code(s) are removed from the said part of the bitstream. The watermark code(s) are put in the said part of the bitstream in place of the selected code(s). The number of bits of the selected code(s) removed from the said part of the bitstream is greater than or equal to the number of bits of the said watermark code(s) put in the said part. The removed selected code(s) are appended to an end of the bitstream and/or placed in watermark user data fields created in the bitstream.
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