Editing List of software patents (section)

===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>