[OSM-dev] Polygon relationificator - CGAL?

Ben Supnik bsupnik at xsquawkbox.net
Tue Sep 15 01:38:44 BST 2009

Hi Frederik,

QPL is GPL incompatible?  Doh!  I was unaware of this...I was aware that 
CGAL is at least contagiously copy-left...not something I terribly like.

My thought though is that for a stand-alone tool this is not necessarily 
a deal-breaker.


Frederik Ramm wrote:
> Hi,
> Ben Supnik wrote:
>> I figure this is as good of a time as any to plug CGAL...it's a hard 
>> core open source comp-geom lib:
> Great piece of software, but it is worth noting that CGAL has a license 
> issue. Parts of it are LGPL (which is ok) but some of the more 
> interesting bits are under a fringe license named QPL which tries to be 
> even more "free" (as in "forcing users to do all kinds of things they 
> would not otherwise do") than the GPL and thus is GPL incompatible.
> The arrangement_2 package for example is one bit that comes under QPL 
> not LGPL, which means that not only must you publish anything you build 
> on top of that (even if used only internally) but also that you cannot 
> incorporate arrangement_2 code into any GPL software.
> See http://www.cgal.org/license.html for the sad details.
> Bye
> Frederik

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