The GNU Free Documentation License (GNU FDL or simply GFDL) is a copyleft license for free documentation, designed by the Free Software Foundation (FSF) for the GNU Project. It is similar to the GNU General Public License, giving readers the rights to copy, redistribute, and modify a work and requires all copies and derivatives to be available under the same license. Copies may also be sold commercially, but, if produced in larger quantities (greater than 100), the original document or source code must be made available to the work's recipient.
The GFDL was designed for manuals, textbooks, other reference and instructional materials, and documentation which often accompanies GNU software. However, it can be used for any text-based work, regardless of subject matter. For example, the free online encyclopedia Wikipedia used to use the GFDL for all of its text.
Read more about GNU Free Documentation License: History, Conditions, Enforcement, Criticism, Other Free Content Licenses, List of Projects That Use The GFDL
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“Love, then unstinted, Love did sip,
And cherries plucked fresh from the lip;
On cheeks and roses free he fed;
Lasses like autumn plums did drop,
And lads indifferently did crop
A flower and a maidenhead.”
—Richard Lovelace (1618–1658)
“Surely the fates are forever kind, though Nature’s laws are more immutable than any despot’s, yet to man’s daily life they rarely seem rigid, but permit him to relax with license in summer weather. He is not harshly reminded of the things he may not do.”
—Henry David Thoreau (1817–1862)