The content is released under a proprietary license.

On other platforms, it is available under proprietary licenses.

The artwork and other media are licensed under a proprietary non free license.

It is paid software distributed under a proprietary license.

The game content remains under a proprietary license.

A proprietary license is a kind of license that has rules defined by its creators or owners.

These packages were published as freeware under a proprietary license imposing some restrictions on usage and distribution.

Works based on the material may be released under a proprietary license as closed source software.

It is released under a proprietary license and is made available free for non-commercial use.

In practice, content producers can choose whether to adopt a proprietary license and charge for copies, or an open license.