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PDFTron Systems offers a free, 60-day evaluation of PDFNet. Once the 60-day evaluation period expires, the library will start generating an exception/error indicating that the evaluation period has expired and the library will stop functioning.
While you try out PDFNet without a license key, it is running in demo mode. One side effect of this is that your application will need read/write access to the registry. This is typically a problem only when you run the app in an environment that requires elevated permissions, such as when developing a Windows service or a server application.
If you are trying to run your demo on an IIS server, you can change the Application Pool’s identity to a User Account with read/write access to the registry.
The most common query regarding the demo/trial mode, arises from errors arising due to insufficient rights. Please see the below threads for mode detail on avoiding/ working around these issues.