Editing List of software patents (section)

==Data compression==

===Data compression in general===
* {{Cite patent|country=US|number=5016009}} {{En dash}} ''(Main article: [[Stac Electronics#Microsoft lawsuit|Stac Electronics]])''
* {{Cite patent|country=US|number=4701745}} {{En dash}} also granted as {{Cite patent|country=GB|number=2172127}}<ref>This link goes to the patent application. Electronic copies of granted GB patents are not freely available</ref> - now expired
: [[Stac Electronics]] sued [[Microsoft]] for patent infringement when Microsoft introduced the [[DoubleSpace]] data compression scheme into [[MS-DOS]].<ref>{{Cite web
 |url=http://www.vaxxine.com/lawyers/articles/stac.html 
 |title=Complaint for patent infringement and Demand for jury trial by Stac Electronics v Microsoft Corporation 
 |accessdate=2007-04-21 
 |url-status=dead 
 |archiveurl=https://web.archive.org/web/20070509205650/http://www.vaxxine.com/lawyers/articles/stac.html 
 |archivedate=2007-05-09 
}}</ref> Stac was awarded $120 million by a jury in 1994 and Microsoft was ordered to recall versions of MS-DOS with the infringing technology.<ref>{{Cite web
 |url         = http://www.msversus.org/archive/stac.html
 |title       = Microsoft Loses Patent Suit
 |publisher   = [[Associated Press]]
 |date        = February 23, 1994
 |accessdate  = 2007-04-21
 |url-status     = dead
 |archiveurl  = https://web.archive.org/web/20070518050821/http://www.msversus.org/archive/stac.html
 |archivedate = May 18, 2007
}}</ref>

===Audio compression===
* {{Cite patent|country=US|number=5579430}} {{En dash}} ''(Main article: [[MP3#Licensing and patent issues|MP3]])''
: One of several<ref>
{{Cite web
 |url=http://www.mp3licensing.com/patents
 |title=MP3 Patent Portfolio
 |publisher=[[Thomson SA|Thomson]]
 |accessdate=2007-04-21}}</ref> patents covering the [[MP3]] format owned by the [[Fraunhofer Society]] which led to the development of the [[Ogg Vorbis]] format as an alternative to MP3.<ref>{{Cite web
 |url=http://xiph.org/press/2003/flac
 |title=FLAC Joins Xiph.Org
 |date=January 29, 2003
 |publisher=[[Xiph.org]]
 |accessdate=2007-04-21}}</ref>

*{{Cite patent|country=US|number=5627938}} {{En dash}} ''(Main article: [[Alcatel-Lucent v. Microsoft]])''
*{{Cite patent|country=US|number=5341457}}
:Two patents owned by [[Alcatel-Lucent]] relating to MP3 technology under which they sued [[Microsoft]] for $1.5 billion.<ref>{{Cite web
 |url=http://crunchgear.com/2007/02/24/patent-monkey-details-on-alcatels-15-b-win-against-microsoft
 |title=Patent Monkey: Details on Alcatel's $1.5 B Win Against Microsoft
 |publisher=CrunchGear
 |accessdate=2007-04-21}}</ref> Microsoft thought they had already licensed the technology from Fraunhofer, and this case illustrates one of the basic principles of patents that a  license does not necessarily permit the licensee to work the technology, but merely prevents the licensee from being sued by the licensor.<ref>{{Cite web
 |url=http://ipkitten.blogspot.com/2007/02/my-thats-lot-of-money.html
 |title=My, that's a lot of money
 |publisher=[[IPKat]]
 |accessdate=2007-04-21}}
</ref>

===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>

===Video compression===
<!-- Note: Please cite sources when adding entries to this list, non sourced entries will be removed -->
{|  class=wikitable
!  width="15%" | Number
!  width="65%" | Comments
!  width="10%" | Other [[Patent family|family]] members
!  width="10%" | Earliest filing <br /> - Grant dates
|- valign="top"
| '''{{Cite patent|country=US|number=6041345}}''' <small> (''Main article: - '') </small>
| A [[Microsoft]] patent covering a method of encapsulating multiple streams of data into a data stream that is implemented in the [[Advanced Systems Format]]. The author of the [[Open-source software|open source]] video capture tool, [[VirtualDub]], which is licensed under [[GPL]] alleged that an employee of [[Microsoft]] requested that he remove support for ASF from his program. The author has said that he does not have the money to pay for a license under the patent and that he would not take a free license that placed restrictions on future uses of his code in violation of GPL.<ref>{{Cite web |url=http://www.advogato.org/article/101.html |title=Advogato: Microsoft patents ASF media file format, stops reverse engineering<!-- Bot generated title --> |access-date=2007-02-12 |archive-url=https://web.archive.org/web/20120204062942/http://www.advogato.org/article/101.html |archive-date=2012-02-04 |url-status=dead }}</ref>
| -
| <small>1996-03-08<br /> {{En dash}}</small> <small>2000-03-21</small>
|}