The next most restrictive kind of license grants unrestricted rights to copy, use, and locally modify. It allows redistribution of modified binaries, but restricts redistribution of modified sources in ways intended to protect the interests of the authors and the free-software community.
The Artistic License, devised for Perl and widely used in the Perl developer community, is of this kind. It requires modified files to contain “prominent notice” that they have been altered. It also requires people who redistribute changes to make them freely available and make efforts to propagate them back to the free-software community.
You can find a copy of the Artistic License at the OSI site.
