LinuxDig.com : Linux Dictionary Term PD

1. Public Domain. Supposedly, the "public" owns the copyright. PD SW is the only SW rightly called "free SW". Note that derivations of PD SW need not remain PD. From Linux Guide @FirstLinux

Source:
Linux Dictionary (version 0.12)
author: Binh Nguyen
linuxfilesystem(at)yahoo(dot)com(dot)au

This Linux Dictionary is distributed under the GNU
Free Documentation License. Online version is at
http://www.tldp.org/LDP/Linux-Dictionary/html/index.htm

2. Realtime Computer Music and Graphics System. A real-time graphical programming environment for audio and graphics analysis and rendering. Pd's audio functions are built-in; graphical computations require a separate package named GEM ("Graphics Environment for Multimedia"). Pd and GEM are available for SGI machines, IBM PC compatibles (running NT or W95) and Linux (PCs or Alpha machines). From Debian 3.0r0 APT