Goggle encrypt and chose any program you like.
Why do you want to encrypt your source? Are you afraid someone will steal your PC?
No, I do not.
The program is run the VPS, someone could steal.
Delete the program after it starts up. Once loaded in memory it does not need source nor executable. But... a clever thief could still find a footprint on your HD.
Anyone who knows what they are doing can, if they have access to the PC and it is not encrypted. I think the best PC security out there is probably truecrypt I have never used it but I have read about it.
The only way MT4 can use an encrypted file is if IT knows the encryption key. Hopeful, that is what's happening with the new MT4.
If you just encrypt with some other program.. of course MT4 cannot read the file - it's like locking your cash in a safe, and then finding you can't spend it.. Seems, currently we have no defence, other than to delete the mq4 file.