Kris,
The LGPL is the same license that pygame uses. Search on google for information about the LGPL to understand the license better. There should be information available on it, as it is one of the most commonly used open source licenses.
the lgpl: http://www.gnu.org/copyleft/lesser.html
this faq seems pretty helpful at explaining it (as applied to another piece of software, but the same answers would apply to pygame / PGU / SDL / etc.) http://www.jboss.org/opensource/lgpl/faq
Kris