Copyleft
TECHNIQUE IN COPYRIGHT LAW OF GRANTING FREEDOMS OVER COPIES OF A WORK, AND OVER DERIVATIVE WORKS BY USING A SHARE-ALIKE PROVISION
Software hoarding; Copyleft licensing; Copy left; Copylefted; Reciprocal licence; Reciprocal license; Copy-Left; Copy-left; Hard copyleft; Strong copyleft; Weak copyleft; Copyleft license; Non-copyleft; Protective software license; Protective FOSS license; 🄯; All rights left; U+1F12F; Notice of copyleft; Copyleft notice; Copyleft symbol; Copyleft sign; Copyleft indication; Indication of copyleft; Copyleft permission; Copyleft character; Copyleft mark; Copyleft logo; Copyleft icon; Full copyleft; Partial copyleft; COPYLEFT SYMBOL; All wrongs reserved; @COPYLEFT ALL WRONGS RESERVED; COPYLEFT ALL WRONGS RESERVED; ALL WRONGS RESERVED; (ɔ)
Copyleft is the legal technique of granting certain freedoms over copies of copyrighted works with the requirement that the same rights be preserved in derivative works. In this sense, freedoms refers to the use of the work for any purpose, and the ability to modify, copy, share, and redistribute the work, with or without a fee.