>I don't mean anything special. You can encrypt a string and use filetostr() to save it to a file. Or, You could use a table (with one record--of course you can encrypt the info). Within this information, you would store a checksum. When your program loads, read the info., do a checksum calculation on the data, and compare it to the checksum stored in the data file. If you get a match, the program continues to load.
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Steve, what is a checksum. what is it supposed to accomplish?

>Cryptor from Xitech seems to be a pretty popular choice as a third-party encryption tool (I've never used it).

Cryptor will encrypt tables i guess.

>I don't have a checksum routine handy...certainly there is one around here.

I'll try the downloads too.
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>This isn't foolproof, anyone with the configuration file can run the program. How do you currently prevent an unlicensed user from running a copy of your application?
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The licence is based on the clinic number. For the application to be useful, the physician is tied to a clinic number(s). And only that person and those associated with that clinic number can benefit from the application e.g. in billing and other management aspects of the application.
Further, physicians are primarily associated with only 1 clinc - but may provide services in offices that have a different clinic number. The number of doctors is also hardcoded in the application. In summary, anyone can load up the application, but is of little use to them since they cannot bill if their clinic number is not coded in by me.

Thanks again.