GNU GPL - Copyright helps Copyleft
The Linksys case


During 2003 the "Linksys" case drew a lot of attention
Linksys was selling 802.11 WLAN Acces Ponts / Routers
Lots of GPL licensed software embedded in the device (included Linux, uClibc, busybox, iptables, ...)
FSF led alliance took the usual "quiet" approach 
Linksys bought itself a lot of time
Some source code was released two months later
About four months later, full GPL compliance was achieved