To the best of my knowledge, there's no legit way to do that. You could ask on the MI list, as those guys would probably know if there is a non-legit way to do that. In any case, I suspect you're not selling your product to MI guys anyway so I wouldn't fret about it. Elvis -----Original Message----- Subject: [C400-L] modules and exported symbols Say that I create some modules with CRTCMOD and create a program out of them with CRTPGM. Can any of the functions exported from the modules be used by a third party in the same way one might use a service program? I think the answer is "not easily", but I'm not sure. I have a function that determines whether a given license key is valid. It's not static to the module it's in, because, of course, other parts of the program need to call it. But I don't want to provide an API that helps people brute out a key.