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.

2022年1月2日 · 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.

2016年8月12日 · 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.

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, 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

Copyleft is a form of licensing: it is not just another name for public domain. However, in a copyleft license, when a person gives or sells a work (changed or not changed) to a friend, the person must allow the friend to do the things which the author of the original work has allowed in the license to the person.

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.

Copyleft is a creation license that consists of releasing a computer program, a work of art or any other type of document for copying, modification and redistribution. It is a legal practice that is carried out in the exercise of copyright.

2021年3月3日 · This guide provides an overview of copyleft, the various types of copyleft licenses, and how to use copyleft to license a creative work.

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