Copy protecting programs

16KVIC20 · Post by **16KVIC20** » Wed Mar 16, 2011 12:58 pm

I remember I used to have various commands that prevented people from breaking into programs that I had typed in.

I suppose if a program loads in one part, if the user simply types LOAD, they can copy it simply by typing SAVE instead of RUN. I know it is a trick I have used in my youth! I suppose one way of preventing that is to write a multi load routine, and then the final part is loaded from that.

As an aside, why do some Anirog games change to a start screen but white with red writing?

Kananga · Post by **Kananga** » Thu Mar 17, 2011 3:00 am

I don't know about Anirog games, but off the top of my head:

Some programs loaded to $3xx- overwriting some vectors which enables them to take control of the computer once loading is finished, so you can't save them easily.

Another widely known trick to prevent listing BASIC programs was to include control characters in REM statements.

16KVIC20 · Post by **16KVIC20** » Thu Mar 17, 2011 7:54 am

OK, thanks Kananga.