legal question

[Paul Howarth]

AragonX wrote:
  Well, INAL, but you can't copywright modifications made to GPLed software.

Of course you can. Copyright is what underpins the GPL. The Linux 
kernel, for instance, contains code copyrighted by a wide variety of 
people. The copyright for (most of) the IP filtering code for instance 
is held by members of the netfilter team, and that's what enables them 
to go after companies breaching their copyright by including netfilter 
code in their products without offering to supply the source code.

See: http://gpl-violations.org/about.html#history

You own the copyright to the modifications you make, unless you assign 
it elsewhere.

Paul.