A method and apparatus embeds and extracts a watermark bit-sequence in a data stream of symbols compressed using dictionary-based compression scheme with variable length indices. The embedding transmits an index value from a set of m-bit index values used to compress symbols in the data stream, identifies...http://www.google.com/patents/US7254250?utm_source=gb-gplus-sharePatent US7254250 - Watermark embedding and extraction method and apparatus in compressed streams
