Initials for the [GNU] '''G'''eneral '''P'''ublic '''L'''icense:
   * The GNU Project: http://www.gnu.org/
   * some [FAQ]s relating to GPL: http://www.gnu.org/licenses/gpl-faq.html
   * compatibility overview GPL v3: http://www.gnu.org/licenses/quick-guide-gplv3.html
   * GPL v1 (1989) license text: http://www.gnu.org/licenses/gpl-1.0.html
   * GPL v2 (1991) license text: http://www.gnu.org/licenses/gpl-2.0.html
   * GPL v3 (2007) license text: http://www.gnu.org/licenses/gpl-3.0.html

See also [LGPL].
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[GPL Scripts] for a discussion on whether it matters if a script.tcl is under GPL.
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