I was wondering what the best and most secure way to protect a bunch of lisp files. I know anything that has been encrypted can be decrypted. So its not the case that i don't want to keep anyone out because its almost impossible. Just maybe someway to add password protection, or specify a length of time the program can be used, or something like that so that not everyone can get in. The reason for this is because I have a few programs(more like 20) that i know my employer is going to want when ever they find out that i do some programming and have done 2 months of work in 2 weeks because of the use of lisp. Just need a way to protect my files from them until I am atleast compensated.

All Ideas welcome.