>Hi,
>
>> Could you tell a good meathod that protect my file of exe created by Vfp cann't be decompiled by others, especilly when I coding C/S structure program, How to protect my program distributed to Client cann't be decompiled?
>
>You can't prevent this. Using tools like Konxise, ReFox, or any other EXE protection tool gives you a slight advantage, but it's only a matter of time that someone cracks the protection if they really want to. Currently, for example, there are claims to crack Konxise and there're websites on how to crack ReFox up to level II.

I side with you.

A year ago I have downloaded and tried several products for shareware protection, in need of protection against decompilation and a way to implement a license scheme. I have dismissed them all. Each had a disadvantage. (I didn't know the product that Walter Meester propagates, so I haven't tested that one.)

Finally, I decided to implement a 'soft' protection scheme.
1) All apps and the exe are compiled with encryption on and debugging off.
2) Sys(9) is checked in almost the first line of the main program. See below.
3) I developed a proprietary license module that uses only a little bit info of the environment.

The last item is probably not an item for Michale Chen, so 1 and 2 are my proposal.

if version(2) # 0 and not inlist( sys(9), <your license> )
   quit
endif