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.

Jan 2, 2022 · Copyleft is a general method for making a program (or other work) free (in the sense of freedom, not “zero price”), and requiring all modified and extended versions of the program to be free as well. The simplest way to make a program free software is to put it in the public domain, uncopyrighted.

Aug 12, 2016 · Copyleft is not a separate legal framework from copyright; copyleft exists within the rules of copyright. So what is copyright? The exact definition varies based on jurisdiction, but the essence is this: the author of a work has a limited monopoly on the copying (hence the term "copyright"), performance, etc. of the work.

Aug 9, 2024 · What is Copyleft? Copyleft is a general method for making a program free software, and all modified and extended versions of the program are required to be free software as well. The simplest way to make a program free is to put it in the public domain, uncopyrighted.

Apr 3, 2025 · Copyleft, license granting general permission to copy and reproduce intellectual property. Where copyright protects society’s interests in invention and creativity by providing individual incentives through copyright control, copyleft protects social interests in knowledge creation by vesting

Mar 19, 2025 · Copyleft, a play on the word "copyright," is the practice of offering users of a work the right to freely distribute and modify the original work, but only under the condition that the derivative works be licensed with the same rights.

Copyleft is a name for a type of a license for free content or free software. [1] It is not the opposite of copyright , but its purpose is the opposite of the purpose of the frequently seen copyright type of license (which uses copyright to forbid changing, giving, or selling something).

Copyleft is a method of making intellectual property reusable and modifiable without any restrictions, except that anything new produced using the original asset must also be available freely. This can apply to everything from works of art to software.

copyleft.org is a defunct collaborative project to create and disseminate useful information, tutorial material, and new policy ideas regarding all forms of copyleft licensing. The Copyleft Guide and Tutorial

The copyright holders grant the freedom to copy, modify, convey, adapt, and/or redistribute this work (except Appendices B – E) under the terms of the Creative Commons Attribution Share Alike 4.0 International License. A copy of that license is available at https://creativecommons.org/licenses/by-_sa/4.0/legalcode.