Siehe entweder die Lizenz selbst oder die
FAQ von Mozilla selbst:
Zitat:
[...]
Files which fall under the
MPL because they are or contain Modifications must be made available as detailed in the license (or elsewhere in this FAQ.)
Other files may be kept proprietary.
One well-known example of this is the Netscape-branded browser. It contains (and Netscape makes source code available for) many files from the Mozilla project, which are under the
MPL. But it also contains proprietary code, for example to integrate with the AOL Instant Messenger service.