In contrasts to non-permissive copyleft -LRB- reciprocal -RRB- licences such as the GNU General Public License , however , any copies and derivatives of the source code created under permissive licences may be made available on terms that are more restrictive than those of the original licence .

In contrast , copyleft licences like the ORGANIZATION@1 require copies and derivatives of the source code to be made available on terms not more restrictive than those of the original licence .
