It would be more clear if your architecture only used postgis to serve data to a non-postgis client application. Maybe you can use postgis this way without providing your custom patches.<br><br><div class="gmail_quote">On Wed, Dec 28, 2011 at 7:10 AM, Greg Troxel <span dir="ltr"><<a href="mailto:gdt@ir.bbn.com">gdt@ir.bbn.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
From: Josh Jordan <<a href="mailto:joshjordan@robotjosh.com">joshjordan@robotjosh.com</a>><br>
<div class="im"><br>
I think it should be ok as long as you open source any custom patches in<br>
the postgis that you distribute.<br>
<br>
</div>This doesn't make sense - that would be for LGPL, more or less.<br>
Certainly one has to provide the source to the GPL component, modified<br>
or not, and regardless of bundling. Perhaps you meant that the bundling<br>
is not distribution, but the GPL obligations on the underlying postgis<br>
distribution remain, in which case I think we agree.<br>
<br>
The question is whether the entire installer is a derived work under<br>
copyright law. If it is, then the GPL components may not be distributed<br>
unless the entire bundle is offered under the GPL. Answering te<br>
is-it-a-derived-work question is close to impossible, depends on one's<br>
jurisdiction, and requires an IP lawyer who understands open source<br>
licensing.<br>
<br>
There's a further subtlely, which is whether code that uses postgis's<br>
interfaces is a derived work. This sort of claim is made for Linux<br>
kernel modules. But, generally no one claims that talking regular SQL<br>
results in a derived work (partly because it's a standard), and this<br>
issue seems to be mostly limited to compilation of modules/plugins<br>
against GPL-licensed headers. But something else to discuss with<br>
counsel :-)<br>
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<br></blockquote></div><br>