Update: Thanks all for helping me here. I probably should rephrase my question. I don't worry about if the users can recover the source since the users I have are all non-IT users and I don't mind sharing the code with other ITs. This is a standalone tkx interface instead of web interfaces, therefore, I hope that I can release just ONE executable file to the users and that's it. Right now, the pp generated .exe file won't run unless I put the .pl file in the same folder (so two files). Is there any way to put everything the users needed into one .exe file? Thanks again.