A significant amount of Free and Open Source Software (FOSS) is covered under
the GNU General Public License (GPL).  Up to about one year ago, this copyright
licese was never contested in court, and there was no precendent on the
enforcibility of it's so-called "copyleft" character.  This has changed since
the Author of this Presentation (Harald Welte) obtained a preliminary
injunction and a court order of the District Court of Munich (Germany) to
enforce the GPL.  Harald will share his experience in legal enforcement of the
GPL.