Most of the games are traps (contain proprietary software) as explained in
the same article I linked (but further up). Going through a few of them that
I am already familiar with:
* AssaultCube, Cube, and Cube 2 contain scripts which have no license
attached (the ".cfg" files).
* Frogatto contains proprietary scripts.
* Katawa Shoujo is almost entirely made up of proprietary scripts, which are
not even in source code form.
* Narcissu is made up almost entirely of proprietary scripts.
* PlaneShift's "content" license places restrictions on what can be done with
the software. It forbids connecting to any server with a modified client, and
it forbids connecting to any unofficial server.
There are many I can't check, because I don't have access to copies of the
games in question. But in most cases I would be quite surprised if they were
not traps (scripting is quite common and scripts are usually included as part
of a game's "data"), and even if they aren't, they're not redistributable in
the first place.
