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While you try out PDFTron SDK 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. The licensed version does not have this requirement. This is typically a problem only when you run an app using the demo version, in an environment with restricted permissions, such as when developing a Windows service or a server application.
The demo version has been used on servers with tight security by modifying a config xml file that controls security settings or using 'Code Access Security Policy' tool. For more info please see:
When running in a server context, you may encounter the following error if registry access is not available to the application.
Error: The evaluation version encountered an error in your system configuration. Please contact customer support at: sup...@pdftron.com. No reg. write rights
Get the answers you need: Support