Licensing

[Dreamer2007]

How can I make my VB application stop functioning when a certain date has arrived without it being obvious in the source code. I use VB 6.0 and SQL 2000.

[Dave Kreskowiak]

By being very creative?? Really, if we all just said how we do it, we'd be violating our own security by "giving away the keys to the kingdom." The key is hiding your information in plain sight by employing judicious use camouflage. VB6 isn't supported by Microsoft anymore, and so library support for VB6 is also fading. Libraries that do things like registration and expiring trials. You'd have to come up with your a method of using and encrypting data that you use to determine the date the app was installed, or the number of times the app was run, or how long the app has been running, or ..., or ..., and even any combination of those information. You store it in some out of the way place that's on everyones machine, either in the Registry or the filesystem somewhere, or both using filenames and registry keys that look like they belong there.

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Dave Kreskowiak Microsoft MVP Visual Developer - Visual Basic
     2006, 2007