Development of Creative Commons licenses

[Gottfried Hofmann <toddd AT mypse.goracer.de>]

> There are different issues with different forms of expression in how 
> practical it is to extract a PD portion of a work.  In a painting, this 
> might be easy, less so with an audio recording, lesser still with a 
> computer program.  Yet all of these are copyrightable works.  And, of 
> course, the CC organization doesn't recommend their copyright licenses 
> for computer programs.


Isn't it commmon among programmers to use public domain code in GPLed 
programs (which means the public domain code will be relicensed to GPL 
in that case)?