Public Domain. When programmers give up copyright of their software code allowing it to be copied and used in other programs. Also used in a general term to describe any freely copied software. Found on http://www.amigahistory.co.uk/p.html
Public Domain - software that is released unconditionally, so that anyone can copy it, alter it, or use it as they wish - the author retains none of the exclusive rights associated with copyright - PD is often used incorrectly to refer to freeware or shareware
Found on http://www.archivemag.co.uk/