Denied, banned or otherwise forbidden. Was accidentally created on the worldofspectrum.org forums by a Portuguese webmaster whose English wasn't very good, in the classic thread "Activision has joined the DENIENCES section".
"Denienced" has become the standard term on WoS for denied-distribution games; it's also used on the retrospec.sgn.net forums as the member-group for banned users.
Too bad Codemasters titles are denienced, otherwise we could *ahem* pass an ISO of the CD and the corresponding loader TAP/TZX between us *ahem* to help each other out *ahem-ahem-ahem*.
-- Marcelo in the WoS thread "Does anyone have the CD codemaster pack?"