Help support Wordnik by adopting your favorite word!

Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A form of licensing that encourages the distribution of software at no charge for noncommercial uses.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The philosophy of using copyrights to enforce freedom of information, especially software source code.
  • n. A software license that follows this philosophy.
  • v. To license under a copyleft license.

Etymologies

After copyright.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Pun on copyright. (Wiktionary)

Examples

  • The Copyleft Foundation, which initiates its course this coming month of October year 2006, issues a formal invitation to participate to all those interested in copyleft and who form a part of the chain of assessment of the arts, culture an science as well as individuals and associative companies.

    Boing Boing

  • The GPL is called a copyleft license, which is wordplay on copyright.

    Linux Today

  • A concept in competition with the idea of copyleft is the "non-commercial" license, which attempts to restrict the use of a work for "commercial" purposes.

    LXer Linux News

  • "copyleft" - software licenses that not only allow copying, but require it.

    Netvouz - new bookmarks

  • It is radical because previous attempts have tried to build on the evident success of the GNU GPL by taking a kind of copyleft approach: using copyright to limit copyright.

    Open Access Data - A Question of Protocol

  • Do you own the copyright, and if so would you be willing to give a general "copyleft" or other no-royalty license?

    Constitutional curiosities: a 21-question scavenger hunt

  • IP practitioners frequently complain about the academythe "copyleft" as they are found sic of saying.

    Scrivener's Error

  • This License is a kind of "copyleft," which means that derivative works of the document must themselves be free in the same sense.

    How To Think Like a Computer Scientist, Learning with Python

  • This approach, known as "copyleft", as opposed to copyright, languished in obscurity until the internet made it easier for far-flung groups of developers to collaborate-which led to an explosion of open-source activity.

    The Economist: Correspondent's diary

  • As a musician, and as an entrepreneur making my living selling equipment to studios and musicians, I obviously have a great deal to lose if the putative forces of "copyleft" somehow succeed in preventing music being paid for.

    Techdirt

Comments

Log in or sign up to get involved in the conversation. It's quick and easy.

  • I can also see them both now

    May 15, 2009

  • I can see both of them here from a different computer, same Firefox, but using Linux this time.

    May 15, 2009

  • How about ?

    May 15, 2009

  • Me neither

    May 15, 2009

  • I can't see it.

    May 15, 2009

  • Can you see a reversed c here? → Ↄ

    I got it from here, but I can't view it on my machine.

    There's been some discussion about the possibility of adding the symbol here.

    May 11, 2009

  • Does the copyleft symbol exist as a font? Is there any right-left equivalent of the upside-down tool whichbe linked to on upside-down?

    May 11, 2009

  • Often used to describe the GPL, the GNU Public License.

    January 8, 2008