El Dom 16 Ago 2009 18:08:18 Bruce Allen escribió:
> Hi Eric,
>
> Do I understand correctly that the only GPL code used by the s...@home
> app is FFTW?
>
> Cheers,
>       Bruce
>

Well, the s...@home app is GPL itself, so most of its code is GPL :)
But in terms of libraries, FFTW seems to be the only one, yes.


The s...@home science app is GPL, plus an exception allowing it to link to 
proprietary FFT libraries. But this isn't compatible with FFTW license (plain 
GPL with no exceptions). If such a combination was compatible, there would be 
a loophole.

Somebody writes some code A and puts it under the GPL, because he doesn't want 
it linked with proprietary code. Somebody else writes a program B and 
licenses it under the GPL with an exception to allow linking it with the 
proprietary library C (maybe by the same author as B). If he could link B 
with A and C, then A would be in the same program as C, which A's author 
doesn't want.

A is FFTW, B is s...@home, and C is a proprietary FFT library. The only way to 
link the three together is to ask FFTW authors for a license exception that 
allows the library to be linked into a program along with other proprietary 
FFT libraries. (SETI already got such a license from FFTW)
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