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Copyleft (a play on the word copyright) is the practice of using copyright law to offer the right to distribute copies and modified versions of a work and requiring that the same rights be preserved in modified versions of the work. In other words, copyleft is a general method for making a creative work as freely available to be modified, and requiring all modified and extended versions of the creative work to be free as well. -- Wikipedia

Various Licenses and Comments about Them - GNU Project - Free Software

Come build a better world with us!
http://www.gnu.org/licenses/license-list.html - Details - Similar

Free content - Wikipedia

The 5Rs are put forward on the Open Content Project website as a framework for assessing the extent to which content is open:
https://en.wikipedia.org/wiki/Free_content - Details - Similar

Open-source software - Wikipedia

This is an accepted version of this page
https://en.wikipedia.org/wiki/Open-source_software - Details - Similar

Open source - Wikipedia

The rank given is based on the activity regarding projects in online discussions, on GitHub, on search activity in search engines and on the influence on the labour market.
https://en.wikipedia.org/wiki/Open_source - Details - Similar

GNU Free Documentation License v1.3 - GNU Project - Free Software Foun

GNU Operating System Supported by the Free Software Foundation
http://www.gnu.org/copyleft/fdl.html - Details - Similar

Melbourne Mobile Detailing - About Us

Melbourne Mobile Detailing is established as the most trusted centre for car truck detailing, car truck cleaning and car paint protection in Melbourne.
https://www.melbournemobiledetailing.com.au/featured/ - Details - Similar

What is Free Software? - GNU Project - Free Software Foundation

Since 1983, developing the free Unix style operating system GNU, so that computer users can have the freedom to share and improve the software they use.
https://www.gnu.org/philosophy/free-sw - Details - Similar

What is Free Software? - GNU Project - Free Software Foundation

Since 1983, developing the free Unix style operating system GNU, so that computer users can have the freedom to share and improve the software they use.
http://www.gnu.org/philosophy/free-sw.html - Details - Similar

What is Free Software? - GNU Project - Free Software Foundation

Since 1983, developing the free Unix style operating system GNU, so that computer users can have the freedom to share and improve the software they use.
https://www.gnu.org/philosophy/free-sw.html - Details - Similar

The GNU General Public License v3.0 - GNU Project - Free Software Foun

GNU Operating System Supported by the Free Software Foundation
http://www.gnu.org/copyleft/gpl.html - Details - Similar

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