Editing List of software patents (section)

===Image compression===
* {{Cite patent|country=US|number=4558302}} (''Main article: [[GIF#Unisys and LZW patent enforcement|GIF]]'')
* {{Cite patent|country=EP|number=0129439}}
: [[Unisys]]'s patent on [[LZW]] compression, a fundamental part of the widely used [[GIF]] graphics format.
* {{Cite patent|country=US|number=4698672}} and its EP equivalent {{Cite patent|country=EP|number=0266049}}
*(''Main article: [[Forgent Networks]]'')
: [[Forgent Networks]] claimed this patent, granted in 1987, covered the [[JPEG]] image compression format. The broadest claims of the US patent were found to be invalid in 2005 following re-examination by the [[United States Patent and Trademark Office|US Patent and Trademark Office]].<ref>[http://www.pubpat.org/forgentjpeg.htm Review of the Forgent JPEG case by the Public Patent Foundation]</ref>
* {{Cite patent|country=US|number=5710835}}
* {{Cite patent|country=EP|number=0864135}}
{{Update|type=section|date=November 2010}}
: This patent, owned by Lizardtech, Inc., was the subject of infringement proceedings against companies including Earth Resource Mapping, Inc. However, Lizardtech lost the trial on the grounds that an important part of their invention was the step of "''maintaining updated sums of discrete wavelet transform coefficients'' from the discrete tile image to form a seamless discrete wavelet transform of the image". Claim 21 of the patent lacked this feature and was therefore obvious. The remaining claims contained this feature, but were not infringed by ERM.<ref>[http://www.ermapper.com/jpeg2000/standards/lt_14032004.pdf Summary Judgment] in LizardTech v Earth Resource Mapping</ref> Internet buzz suggested the patent covered the [[JPEG 2000]] image compression format but the additional feature of the valid claims appears not to be a JPEG 2000 requirement.<ref>[http://www.lizardtech.com/press/news.php?item=11-01-2004 LizardTech press release, 1 November 2004] and [http://www.ermapper.com/company/news_view.aspx?PRESS_RELEASE_ID=356 ERM press release, 2 November 2004]</ref>