I was maintaining a uClinux router distro back in 2003, one of the router in our list ended up in court for the first legal case for GPL violation in Germany:

https://isl3893.sourceforge.net/

"17 apr 2004 - GPL testing in court by the Netfilter/Iptables team, due to refuse to give source code of the Sitecom WL-122 (isl3893 based!). In the same time, some source code has appeared on the webserver of Sitecom."