The About page contains information about the version and edition you have installed plus the option to change the interface Language and Check for updates.
novaPDF is available as a trial version. It is fully functional for 30 days. During the trial version, a notice is printed on each PDF page mentioning the novaPDF. The notice will be removed from further created PDF files when you buy and activate novaPDF. If you've already purchased it you can visit the Activate section to activate the program.