copyleft.org

============

## What is Copyleft?

Copyleft is a strategy of utilizing copyright law to pursue the policy goal

of fostering and encouraging the equal and inalienable right to copy, share,

modify and improve creative works of authorship.  Copyleft (as a general

term) describes any method that utilizes the copyright system to achieve the

aforementioned goal.  Copyleft as a concept is usually implemented in the

details of a specific copyright license, such as the GNU

[General Public License (GPL)](http://www.gnu.org/copyleft/gpl.html) and the

[Creative Commons Attribution Share Alike License](http://creativecommons.org/licenses/by-sa/4.0/).

Copyright holders of creative work can unilaterally implement these licenses

for their own works to build communities that collaboratively share and

improve those copylefted creative works.

## What is copyleft.org?

copyleft.org is a collaborative project to create and disseminate useful

information, tutorial material, and new policy ideas regarding all forms of

copyleft licensing.

This site itself is licensed under a copyleft license, and has received

contributions from experts around the world.  Thus, copyleft.org is the

premier "meta-project" of copyleft: it's useful copylefted information all

about copyleft itself!

### The Copyleft Guide and Tutorial

The primary project currently on this site is a tutorial book entitled

[*Copyleft and the GNU General Public License: A Comprehensive Tutorial and Guide*](/guide/).

This guide describes the policy motivations for copyleft, presents a detailed analysis of the text of

various copyleft licenses, and gives examples and case studies of copyleft compliance situations.

### Getting Involved

There are various ways to get involved with this project.  The primary

copyleft.org website is a wiki, and we welcome helpful edits and additions.

For the aforementioned guide and tutorial about GPL and other copyleft concepts,

we seek help in the following ways:

#### Proposing Improvements to the Guide

[Pull requests on copyleft.org's Kallithea site](https://k.copyleft.org/guide/pull-request)

to the Guide are most welcome. If you're looking for something to fix, just

grep the *.tex files for "FIXME" and you'll find plenty.  Many of them are

simple and easy to do.  Some of them are writing, and some of them are

formatting-related.

#### Joining Mailing Lists

   * Subscribe to our low-traffic [announcements-only mailing list](https://lists.copyleft.org/cgi-bin/mailman/listinfo/announce).

   * Join discussion on our [primary mailing list, called "discuss"](https://lists.copyleft.org/cgi-bin/mailman/listinfo/discuss).

#### IRC Discussion

The copyleft.org

[IRC channel is #copyleft on irc.freenode.net](irc://irc.freenode.net/#copyleft).

The [IRC logs are public here on this site](/irclogs/).

### Who Contributes to copyleft.org?

This site is a joint project of

[Software Freedom Conservancy](https://sfconservancy.org/news/2014/nov/07/copyleft-org/) and the

[Free Software Foundation](http://www.fsf.org/news/software-freedom-conservancy-and-free-software-foundation-announce-copyleft.org).  The editor-in-chief of

[the guide](/guide/) is [Bradley M. Kuhn](http://ebb.org/bkuhn).  The

[recent changes page](/recentchanges) shows who has

contributed to the wiki, and you can see the

[Git commit log on the tutorial](https://k.copyleft.org/guide/changelog)

to see who has contributed to it, and

[[see the list of users who contribute to this Wiki|users]].

### URLs You Can Memorize!

copyleft.org has many easy-to-remember URLs.  These are convenience URLs that

you can memorize and give to people verbally to point them to the right part

of [The Guide](https://copyleft.org/guide/).  (Since the guide is very large,

we thought a few easy-to-remember ways to tell people where to look would be

helpful.)  Here are the primary ones:

  * [copyleft.org](https://copyleft.org) points to this page.

  * [copyleft.guide](http://copyleft.guide) points to the guide itself.

  * [compliance.guide](http://compliance.guide) points to the *GPL Compliance Guide* section of the full Guide.

  * [gpl.guide](http://gpl.guide) points to the *Detailed Analysis of the GNU GPL and Related Licenses* section of the full Guide.

As time goes on, we'll add convenience URLs to refer to specific parts of the

guide, which makes it easy to refer people to portions of the Guide.  Here

are a the ones that exist so far:

  * [compliance.guide/pristine](http://compliance.guide/pristine) points to

    the "pristine example", the chapter entitled *ThinkPenguin Wireless Router: Excellent CCS*.

  * [compliance.guide/offer-for-source](http://compliance.guide/offer-for-source) points to

    the section regarding using the offer for source provisions in GPLv3§6(c) and/or GPLv2§3(b).

### Offsite Resources

#### More on "What Is Copyleft?"

Here are a few external resources to read regarding the general concept of copyleft:

  * [Richard M. Stallman's essay on copyleft at gnu.org](https://www.gnu.org/copyleft/)

  * [The Wikipedia entry on Copyleft](http://en.wikipedia.org/wiki/Copyleft)

    (The definition of copyleft at the top of this page is modified version

    of the first paragraph of that Wikipedia entry).