you could archive your files with winrar, and set a password to the archive. I have seen games that archive all the files, and the engine is able to read off the archive. Not sure if gamestudio has that capabiltiy (wether it is a matter of coding, or something more in depth). Just an idea, never tested...
"Read not to contradict and confute, nor to find talk and discourse, but to weigh and consider." Sir Francis Bacon
www.deckscapedesign.com
there are tools which add some lines to your CD image (before you burn it), so the CD cannot be copied by the average pc user (but RAW copy does always work).
anyway, i´d too be interested in any better method...