It's unfortunate that neither this BBC Micro game nor the Fort Apocalypse game are free software -- software one is free to run, inspect, share, and modify (even commercially).

The Crazee Rider software seems to lack a license at all. Thus no permission is granted to engage in the freedoms of free software.

Fort Apocalypse is also nonfree; it is distributed under a nonfree license -- http://creativecommons.org/licenses/by-nc-nd/2.5/ -- that even the license's author recommends against using for software per https://creativecommons.org/faq/#can-i-apply-a-creative-comm... .