Netscape Public License
The Netscape Public License (NPL) is a free software license, the license under which Netscape Communications Corporation originally released Mozilla.
Its most notable feature is that it gives the original developer of Mozilla (Netscape, now a subsidiary of AOL), the right to distribute modifications made by other contributors under whatever terms it desires, including proprietary terms, without granting similar rights to these other contributors in respect to contributions made by the original developer. This allowed the release of the Netscape 6 and later versions as proprietary software.