On Tue, Oct 25, 2011 at 01:41:17PM +0200, Thomas Kellerer wrote: > Thank you very much for the detailed explanation. > > I always have a hard time to understand the GPL especially the > dividing line between "using", "linkin" and creating a derived work. That because the GPL does not get to define those terms. They are defined by copyright law, the licence does not get to choose what is a derived work and what isn't. The FSF is of the opinion that anything linked to a GPL library is a derived work, but that isn't true in all cases (libedit vs libreadline is one of those borderline cases). I note in the OPs case they are relying on the customer to install PostGIS. The GPL only applies to *redistribution* not usage. So if you're not supplying your customers with PostGIS then the fact that it's GPL seems completely irrelevent. Have a nice day, -- Martijn van Oosterhout <kleptog@xxxxxxxxx> http://svana.org/kleptog/ > He who writes carelessly confesses thereby at the very outset that he does > not attach much importance to his own thoughts. -- Arthur Schopenhauer
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