The terms appended to the version number are markers from the "Warez" or software piracy scene:
. It lacks over a decade of critical security patches and stability updates. Using such an old version makes your computer highly vulnerable to modern exploits embedded in malicious PDF files. Review of Foxit PhantomPDF Business (v6.2.1) The terms appended to the version number are
: Adopted the Microsoft Office-style toolbar for easier navigation. OCR Support The terms appended to the version number are