Teema 7. How does a copyleft affect the selection of a license?

CopyLEFT, distinguished from CopyRIGHT, is the practice of offering people the right to freely distribute copies and modified versions of a work with the stipulation that the same rights be preserved in derivative works created later.[1] Copyleft software licenses are considered protective or reciprocal, as contrasted with permissive free-software licenses.[2] (Wiki)

Essentially, Copyleft is a part of an umbrella licenses used for different ways to protect free distribution of authors’ work with several levels of protection and couple of restrictions, as Copyleft licence is a protective license, thus limiting some parameters of its use:
prohibition of appropriation (cannot make the source code “closed”, it must remain open).
requirement to distribute derivative work under the same license

And from these restrictions we can see that the use of Copyleft, although is very noble and well-intended for the good of the public, has its own limitations.

We take our knowledge from Wikipedia again: Wiki

“Weak copyleft” - mainly used in creation of the software libraries, and this “weak” restriction allows user to compile, link and re-distribute subsequent products without any re-licensing requirements. GNU Lesser General Public License and the Mozilla Public License are such examples here.

“Strong copyleft” - is a Copyleft license with much stronger rules that insist on prohibition of propriotization and demand to keep the source code public to subsequent work.

  • GNU General Public License is an example case for Strong copyleft type license. 
  • AGPL which requires the publishing of the source code also for the usage case software as a service 

“Full and partial copyleft” - these types of licences of Copyleft group of licences are covering the question: is the full work covered by requirements of copyleft or only some parts of this work. For example GPL linking exceptions made for some software packages  .

“Share-alike” (SA) - is serving the protection of the freedom from copyright  that original work has, must be granted also to subsequent works. Without share-alike, derivative works might be sublicensed with compatible but more restrictive license clauses, e.g. CC BY to CC BY-NC.) Wiki

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