Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

Etymologies

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

[After copyright.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Pun on copyright.

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

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

    Linux Today

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

    Linux Today

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

    Netvouz - new bookmarks

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

    Netvouz - new bookmarks

  • "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

Comments

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

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

    January 8, 2008

  • 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

  • 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

  • I can't see it.

    May 15, 2009

  • Me neither

    May 15, 2009

  • How about ?

    May 15, 2009

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

    May 15, 2009

  • I can also see them both now

    May 15, 2009