Interesting question... would this be for classroom / kiosk use (no random / off-subject browsing), child protection (no age-inappropriate browsing), or some other purpose?
You could block web browser access without blocking access to the rest of the software if you simply disabled / had us disable / didn't purchase the built-in document reader, but that would also lose access to the reader for text files and such. It wouldn't be too difficult for us to add a password-protected option to disable the web browser without disabling the rest of the document reader, I suppose, though it's a little tricky because we'd have to also check for / block outside links in local HTML documents in order to avoid creating an easy security hole.
Adding a whitelist / blacklist for web sites would be more difficult, however, though if there's demand for it I suppose we could consider that in a future release.
You could block web browser access without blocking access to the rest of the software if you simply disabled / had us disable / didn't purchase the built-in document reader, but that would also lose access to the reader for text files and such. It wouldn't be too difficult for us to add a password-protected option to disable the web browser without disabling the rest of the document reader, I suppose, though it's a little tricky because we'd have to also check for / block outside links in local HTML documents in order to avoid creating an easy security hole.
Adding a whitelist / blacklist for web sites would be more difficult, however, though if there's demand for it I suppose we could consider that in a future release.