Open Invention Network (OIN) is an intellectual property rights company based in Durham, United States.

These members are obligated not to assert their own patents against Linux and its associated systems and applications as per the terms of the licensing agreements established by OIN.

[5] The list of applications considered by OIN, according to Red Hat's Mark Webbink,[6] includes Apache, Eclipse, Evolution, Fedora Directory Server, Firefox, GIMP, GNOME, KDE, Mono, Mozilla, MySQL, Nautilus, OpenLDAP, OpenOffice.org, Open-Xchange, Perl, PostgreSQL, Python, Samba, SELinux, Sendmail, and Thunderbird.

[7] On March 26, 2007, Oracle licensed OIN's portfolio, thus agreeing not to assert patents against the Linux-based environment, including competitors MySQL and PostgreSQL[8] when used as part of a Linux system.

This expands OIN’s and its partners’ patent non-aggression activities by deterring PAEs from targeting Linux and adjacent OSS technologies relied on by developers, distributors and users.

[15] Every 18 months to two years, Open Invention Network updates the list of software packages that it defines at its Linux System definition.

Florian Mueller's credibility in attacking OIN has been called into question due to his paid relationship with corporate sponsors.