"A German court has required a company to comply with the terms
of the General Public License, giving some legal weight to the
increasingly important document that governs Linux and innumerable
other open-source programs.
"The case involves netfilter/iptables, open-source networking
software for tasks such as firewalls for protecting a network from
unwanted traffic. Harald Welte, one of the main netfilter authors,
sued a Dutch company, Sitecom, alleging it used the software in a
wireless network product without abiding by the terms of the
General Public License..."