There are several major types of free open-source copyleft licenses that are widely used in the open-source software community. These licenses ensure that software and its derivatives remain free and open-source. Let's explore a few notable examples:

One well-known copyleft license is the GNU General Public License (GPL). It's often used for projects hosted by the Free Software Foundation (FSF). The GPL requires that any modifications or additions made to the original software are distributed under the same terms, ensuring its continued openness. You'll find different versions of the GPL, such as GPL-2.0 and GPL-3.0.

Another popular copyleft license is the GNU Lesser General Public License (LGPL). It has a more permissive approach, allowing the use of the licensed software in both open-source and proprietary projects. If modifications are made to LGPL-licensed software, only those specific changes need to be distributed under the LGPL.

For software distributed by the Mozilla Foundation, the Mozilla Public License (MPL) is commonly used. It permits combining MPL-licensed code with proprietary code or other open-source licenses. If modifications are made to the MPL-licensed code, those changes must be made available under the MPL.

In the realm of networked and web-based software applications, we have the Affero General Public License (AGPL). This license is a variation of the GPL and requires that users interacting with the software over a network are provided with the source code. It ensures that modifications made to the software are accessible to users remotely.

The Eclipse Public License (EPL) is primarily used within the Eclipse software ecosystem. It's a copyleft license that allows combining EPL-licensed code with code under other licenses, including proprietary ones. Any modifications to the EPL-licensed code must be made available under the EPL.

These licenses have their own specific terms and conditions, but they all share the goal of promoting free and open-source software by ensuring accessibility and modifiability by the community.
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