Answer:
Step-by-step explanation:
copyleft:
Copyleft is the practice of granting the right to freely distribute and modify intellectual property with the requirement that the same rights be preserved in derivative works created from that property.
creative Commons:
Creative Commons (CC) is an internationally active non-profit organisation that provides free licences for creators to use when making their work available to the public. These licences help the creator to give permission for others to use the work in advance under certain conditions.
Every time a work is created, such as when a journal article is written or a photograph taken, that work is automatically protected by copyright. Copyright protection prevents others from using the work in certain ways, such as copying the work or putting the work online.
CC licences allow the creator of the work to select how they want others to use the work. When a creator releases their work under a CC licence, members of the public know what they can and can’t do with the work. This means that they only need to seek the creator’s permission when they want to use the work in a way not permitted by the licence.
The great thing is that all CC licences allow works to be used for educational purposes. As a result, teachers and students can freely copy, share and sometimes modify and remix a CC work without having to seek the permission of the creator
3. GNU/GPL:
GPL is the acronym for GNU's General Public License, and it's one of the most popular open source licenses. Richard Stallman created the GPL to protect the GNU software from being made proprietary. It is a specific implementation of his “copyleft” concept.
Software under the GPL may be run for all purposes, including commercial purposes and even as a tool for creating proprietary software, such as when using GPL-licensed compilers. Users or companies who distribute GPL-licensed works (e.g. software), may charge a fee for copies or give them free of charge.