gentoo-overlay/licenses/no-source-code

Gentoo license note: This package is distributed in binary form and
its source code is not made available. This renders the package
non-free in terms of the Free Software Definition [1], the Open Source
Definition [2], or (for works other than software) the Definition of
Free Cultural Works [3], even if it is distributed under a free
software license. Source code is the preferred form in which a
programmer would modify the work.

The "no-source-code" license label must never be used on its own, but
only along with the license under which the package is distributed.

[1] http://www.gnu.org/philosophy/free-sw.html
[2] http://opensource.org/osd
[3] http://freedomdefined.org/