Copyleft Definition

kŏpē-lĕft
noun
A form of licensing that encourages the distribution of software at no charge for noncommercial uses.
American Heritage

The philosophy of using copyrights to enforce freedom of information, especially software source code.

They believe in copyleft because they want their software to be used freely by anyone.
Wiktionary

A software license that follows this philosophy.

I have placed my program under copyleft.
The GNU General Public License is a copyleft licence.
Wiktionary
verb
To license under a copyleft license.
Linus Torvalds copylefted the Linux kernel.
Wiktionary

Other Word Forms of Copyleft

Noun

Singular:
copyleft
Plural:
copylefts

Origin of Copyleft

  • Pun on copyright.

    From Wiktionary

  • After copyright

    From American Heritage Dictionary of the English Language, 5th Edition

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copyleft