The unofficial copyleft symbol, a mirror image of the official copyright symbol

Copyleft is a play on the word copyright, for the practice of using copyright law to give freedom to the users of your work, on the condition that the same rights and freedoms be preserved in modified versions of the work.

Copyleft is found in licenses such as CC-BY-SA, the SA or "ShareAlike" indicating the the condition of continued sharing. This is the license used by Appropedia. Other examples include GFDL and computer software licenses.

It is also considered that a license which restricts the Four Freedoms is not copyleft.[1] E.g. CC-BY-NC-SA is not copyleft in this view, as it is has a non-commercial clause,

Applying copyleft[edit | edit source]

Common practice for using copyleft is to codify the copying terms in a license. Any such license typically gives each person possessing a copy of the work the "Four Freedoms" (from the Free Software Definition):

0. the freedom to use the work,
1. the freedom to study the work,
2. the freedom to copy and share the work with others,
3. the freedom to modify the work, and the freedom to distribute modified and therefore derivative works.

Notes[edit | edit source]

FA info icon.svg Angle down icon.svg Page data
Authors Joe Dye, Chris Watkins
License CC-BY-SA-3.0
Language English (en)
Translations French
Related 1 subpages, 14 pages link here
Impact 419 page views
Created March 1, 2010 by Chris Watkins
Modified March 29, 2024 by Kathy Nativi
Cookies help us deliver our services. By using our services, you agree to our use of cookies.