"Cisco, the networking giant, should know better than
this, but they've worn out the FSF's (Free Software Foundation)
patience. So, Cisco is now being sued by the SFLC (Software Freedom
Law Center) on behalf of the FSF for Linux and other GPL copyright
violations.
"You see, Cisco, like many other networking companies use Linux,
and other free software programs like GCC, binutils, and the GNU C
Library in their products. Specifically, Cisco uses these programs
in its Linksys line. In fact, the FSF first brought Cisco's
improper use of open-source code to the company's attention back in
2004 with its use in the Linksys WRT54G wireless router."