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I'd like to implement "time limit" in the demo version of my application, but I can't come up with a good way to do this. Most of what I came up with is lame (ie easy to crack). I googled around a bit too. I found lots of comments on how not to implement it, but not much on how to implement it.
Those of you with experience with such things, would you be able to recommend a decent enough way that will work for most non-techsavvy users?
If you don't want to reveal your method online, please feel free to email me.
Please don't tell me to use Armadillo or other commercial solution as I already considered those.
And please don't worry about any side effects of having this kind of limitation.
If you're using Delphi or C++ Builder, you might try TurboPower OnGuard.
They have a pretty good system there.
The primary element lacking is persistence, so you have to decide how you want to store the various keys. I would use an INI file or the registry.
See this: http://discuss.joelonsoftware.com/default.asp?biz.5.301379.16 amongst others.
Monday, January 30, 2006
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