VLX files are machine code and while there was a reported decoder, it has not been made public. As far as the AutoCAD Protected Lisp files go, there is something floating around the web....I personally question the ethics of decompiling protected code.
Once upon a time when I worked for a previous employer, I too wrote time delay and specific other criteria for executing the program, one was that I worked there. Once I was no longer employed, the program would likely no longer work because my local account on their server would be terminated.....
Why did I do this ... well it was for several reasons ...
1) I was NEVER compensated for the programming.
2) I compiled all of it at home
3) I specifically designed it to make my job easier, not for my employers benefit.
4) I used code snippets gathered from other sources, such as Cadalog and CadDepot.
5) They were jerks