Subj : Re: Copyright and addons or comercial GUI for a GPL software
To   : comp.programming
From : aslanski2002
Date : Thu Aug 11 2005 02:02 am


Jonathan Bartlett yazdi:
> > Are there any restrictions in using GPL code in comercial applicatins?
>
> Yes.
>
> > I have seen the Linux Kernel used on a lot of appliances.
>
> That's because the kernel is not linked to the program.
>
> > My intention as I mentioned in an earlier  thread is to design a good
> > interface for some GPL applications and to sell this interface.
>
> Selling is not against the GPL.  Selling under non-GPL licenses is.
>
> > I will
> > not charge for the application itself but I think it is fair to charge
> > for the interface. The design requires a lot of work for design and
> > implementation.
>
> The amount of work is irrelevant.  What is relevant is whether or not
> your work is considered a derivative work.
>
> If you link to libraries, that is usually considered a derivative work.
>   Static linking definitely is, dynamic linking using headers supplied
> under the GPL also is.  I do not know of the rules for dynamic linking
> without the GPL headers.  However, if you are not linking to the GPL
> work, but merely using it as a separate application, there is no
> problem.  In fact, I know Mathematica does this.  If you look on the CD
> they distribute you will see a source file containing a GPL application
> which they use as a separate, unlinked application but is distributed
> with Mathematica.
>
> As for LGPL libraries, there are other rules.  With those, you are
> allowed to freely dynamically link.  For static linking, there are more
> rules, but basically you have to provide the unlinked versions of both
> your code and the libraries, so the user can upgrade the library and
> relink if he wishes.
>
I have questions here:
I have an application *A* which uses a DLL *D1* with (L)GPL code in it
and another *D2* which has no (L)GPL code. *A* still can work if you
delete *D1* (though not fully functional). And *A* has no (L)GPL code
in it.
- Do I still have to provide sources for *A* ?
- I don't think I have to provide the sources of *D2*, do I?

> Jon
> ----
> Learn to program using Linux assembly language
> http://www.cafeshops.com/bartlettpublish.8640017

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