I would imagine, once a schematic is in the public domain, it would not take but a slight modification to "make it your own" and it no longer is exactly like the orignal.  Sure it may be fit, form and function but its not identical.  I dont think there really is a way to completly protect it from duplication.

--- On Thu, 7/30/09, Marc Nicholas <geekything@gmail.com> wrote:

> From: Marc Nicholas <geekything@gmail.com>
> Subject: Re: [OT] Open Hardware Design
> To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> Date: Thursday, July 30, 2009, 5:53 AM
> Hi Tamas,
> 
> Try Creative Commons share-alike non-commercial attribution
> license:
> 
> http://creativecommons.org/about/licenses
> 
> There are others using this for hardware/schematics etc.
> For example,
> Sparkfun wrote a little blog posting about their use of the
> CC licenses:
> 
> http://www.sparkfun.com/commerce/news.php?id=278
> 
> Hope that helps!
> 
> -marc
> 
> 
> On Thu, Jul 30, 2009 at 6:40 AM, Tamas Rudnai <tamas.rudnai@gmail.com>wrote:
> 
> > Hi All,
> >
> > Is there any license similar to GPL for hardware
> design? I mean if you
> > create a schematics and/or pcb that you publish you
> can say that it is not
> > allowed for commercial reproduction and that
> republishing it is only
> > possible by crediting the original design including
> any modification to it?
> >
> > Thanks
> > Tamas
> > --
> > http://www.mcuhobby.com
> > --
> > http://www.piclist.com PIC/SX FAQ & list archive
> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
> >
> -- 
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
> 


      
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist