Week - 6 Copyleft

Intro

    While Copyleft can be granted to users to change and distribute the intellectual property under the derivation of the "host", Copyright exists in order to protect author of documentation. During the Copyleft author is capable of placing his/her copyright into the document.

Strong Copyleft

    As I said Copyleft is set to guarantee the freedom of the software distribution and modification but first creator has most of the rights. It means source code should be available with the copy of a license and acknowledgment from author. Lets mention a little bit of history. Firstly we met Copyleft license in 1985 by Richard Stallman the Emacs General Public License  and it is still used in many copylefted software such as GNU. But everything is not as easy as it seems. While you are in the head of a company and trying to choose between licenses you should carefully think about it. What kind of company business are you going to deal with in the future? What kind of strategy will you play? Asking these questions before doing anything will come in handy. If you choose Copylefted license and you modify it for you taste and then distribute new software based on it you must make your code open-source with its' permissions and companies working with linux kernel have these kind of problems very often. But we do not meet afore mentioned problems under the permissive licenses, because they do not require companies to distribute modifications. Moreover, it is more convenient while GPL does not work well with other open soured licenses.

Weak Copyleft

    Weak copyleft is a license where inheritance is depended on the derivation of a process. They are mostly used for software libraries but  we also meet weak copyleft examples in large projects such as Mozilla, OpenOffice.org and LibreOffice. It is in the middle of strong copyleft and permissive license, giving users flexibility in the provisions. One of the main disadvantages from my point of view is economic viewpoint. MLP for example does not charge extra for source code, but selling copies is out of your privileges and also there are exceptions for every version of MLP and it can be very complicated to answer this directly.

No Copyleft 

    Non Copyleft license give you possibility to implement software under some other licenses, including a proprietary one. We meet non copyleft licenses in Apache License Version 2.0, BSD License, MIT License, LGPL. The advantage of No copyleft is that you can reuse proprietary software under the license and for educational purposes it may be amazing choice, while you can derive and distribute new copies. In Georgia there are several universities who use MIT freeopencourseware with modified versions and they really do benefit from that. Lots of giant projects such as X Windows Systems, Ruby on Rails, Node.js ... use MIT license. From 2015 reports, MIT was the most popular software license on Github.

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