You can optionally change your application pool's identity to a user account (as opposed to system accounts). Provided that the user account has read/write access to the registry, the trial version of PDFNet will work under this identity in IIS. You can use a user account with your application pool by doing the following:
1. Go to IIS Manager, select the web server, and then to Application Pools.
2. Click on the application pool you are using from the list, then on the Actions panel, under Edit Application Pool, click Advanced Settings...
3. In the Advanced Settings dialog, go to the Process Model section and click on the Identity to change it.
4. Once the Application Pool Identity dialog shows up, select Custom account:, then click Set...
5. Enter the user account information in the Set Credentials dialog box. Note: you may have to specify the domain of the user (i.e. MyServerDomain\MyUserAccount).
6. Click OK until all dialog boxes are closed.
Keep in mind that this is not an ideal solution for production environments as your application is now more privileged. Should you wish to use PDFNet on a production application, we suggest obtaining a license to remove demo limitations.