paFileDB 3 is free for personal and commercial use, however, you must keep the copyright info on the bottom of the page where it is.
Although it is not required, phpMyAdmin will allow you to back up your MySQL database and restore it in case it gets damaged and becomes unusable.
To view paFileDB 3 properly, your browser requires CSS support. All popular browsers, such as Internet Explorer, Netscape, Mozilla and Opera support CSS.
paFileDB 2.x hacks and modifications will not work with paFileDB 3, but most of the feature hacks for paFileDB 2.x are already standard features in paFileDB 3.