Spec URL: http://tomspur.fedorapeople.org/review/python-polygon.spec
SRPM URL: http://tomspur.fedorapeople.org/review/python-polygon-2.0.3-1.fc15.src.rpm
Description:
Polygon is a python package that handles polygons in 2D. It contains 
Python bindings for gpc, the excellent General Polygon Clipping Library by 
Alan Murta and some extensions written in C and pure Python. With Polygon you 
may handle complex polygonal areas in Python in a very intuitive way. Polygons 
are simple Python objects, clipping operations are bound to standard operators 
like +, -, \|, & and ^. TriStrips can be constructed from Polygons with a 
single statement. Functions to compute the area, center point, convex hull and 
much more are included.

$ rpmlint ~/rpmbuild/RPMS/x86_64/python-polygon-* ~/rpmbuild/SRPMS/python-polygon-2.0.3-1.fc15.src.rpm 
python-polygon.x86_64: W: spelling-error %description -l en_US gpc -> GP
python-polygon.x86_64: W: invalid-license LGPL
python-polygon-debuginfo.x86_64: W: invalid-license LGPL
python-polygon.src: W: spelling-error %description -l en_US gpc -> GP
python-polygon.src: W: invalid-license LGPL
3 packages and 0 specfiles checked; 0 errors, 5 warnings.

Send a private mail to the author about the license version, for the moment it's only LGPL everywhere in the tarball.

Another issue is that polygon uses a private copy of gpc, requesting a exception from FPC (will post link here).