You can really only discourage a determined person from using a time-limited application, unless you use more sophisticated DRM-like approaches. There are a couple of simple things you can do. Add a nag dialog that periodical reminds the user the trial expires in x days, or expired x days ago, along with a link to upgrade and purchase a license for the application. Limit the features to the extent the user can reasonably evaluate the application, while enhancing the value proposition of buying the full version. Require a trial activation key, emailed to the user, and required to activate the application after it is installed. This increases the effort of simply re-installing the application.
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