Re: Combining GPL and commercial license

[Marcin Giedz]

John Hasler napisał(a):
> Marcin Giedz writes:
>   
> > I've been searching/googling web sites to find out one question: is it
> > possible to use GPL software/part of code in commercial application WITH
> > VERY visible caption "THIS part comes from xxxx and is based on GPL
> > license"?
> >     
>
> If you are the only copyright owner you can distribute under as many
> different licenses as you see fit.  No disclaimers are required.  If you
> are not the only copyright owner you must have permission from the others.
>   
OK Thank you VERY much for all information, but it's still not very 
clear to me (however now I see the difference with Trolltech - thanks) : 
let's assume for a moment that my "company" is like Apple ;) with their 
OS as a whole + internal part which is Safari. We know that Safari is 
based on KHTML GPL code but MAC OSX is commercial product anyway. So 
what about Safari in this case? What license do they use? (I'm not a MAC 
user so I'm asking such question). Is there a "note" that Safari is GPL?

The same situation is with our software. We've built application from 
scratch and this is our code but to present a tiff file to user we use 
libtiff library. The same with PDF - we use xpdf library. Now we'd like 
to provide something like "dual" license for this product - GPL (no 
problem with this) and commercial (for OUR code - simple to survive ) - 
but what about such things like libtiff and xpdf in this situation? Can 
we use it? If yes what is an obligation? If not - what is an option?

Regards,
Marcin