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Looks like the LZW patent doesn't expire until June 2003. Updated the

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comment to reflect this.
This commit is contained in:
Andy McFadden 2002-10-06 00:25:53 +00:00
parent cb401c7280
commit 656b2b0a33
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nufxlib-0/Lzw.c
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@ -8,8 +8,9 @@
* and Andy Nicholas.
*
* Unisys holds US patent #4,558,302 (filed June 20, 1983 and issued December
* 10, 1985). Patents are good for 17 years from date of issue, so the
* patent remains in effect until the end of 2002.
* 10, 1985). A policy set in 1995 specifies the lifetime of a patent as
* the longer of 20 years from the date of application or 17 years from the
* date of grant, so the Unisys LZW patent will expire on June 20, 2003.
*
* The Unisys patent is one of many that covers LZW compression, but Unisys
* is the only company actively attacking anyone who uses it. The statement