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June 21, 2003 the LZW patent on compression/decompression expired
LZW compression is used in GIF and certain TIFF formats.
As of June 21,2003 the LZW patent on compression/decompression expired in all
countries except Canada, United Kingdom, Germany, France, Italy and Japan.
In the listed countries the LZW patent will expire in June/July 2004.
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