The GPL is what is known as a "strong copyleft." It requires that if GPL software is combined with other software in the same Program, then the entire Program must be governed by the GPL. The MPL allows code governed by the GPL to be combined with code that is not governed by the GPL in the same Program.

As a result, those people who feel a strong copyleft is critical prefer the GPL. Those people who want to retain more choice about what happens to combinations of code often prefer the MPL. The MPL was written to require people to keep MPL code open source, and also to allow combinations with closed source code.

There are other differences, but that is usually the one people think about first. There is some additional information at http://www.mozilla.org/MPL/FAQ.html. It's from the original launch of the Mozilla project, but much of the info is still valid, even though the MPL is now managed by the Mozilla Foundation rather than Netscape.

Mitchell

Jack wrote:

Hello,

Is one more rigid than the other ?  Does anyone know what the
pros/cons are, or is there a webpage that explains this - I could not
find on the web.

Thanks!

Jack
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