READ & WRITE "TASK6. What impact does the copyleft have on choosing a software license for one's project?

 





STRONG COPYLEFT

  • These licenses demand that all the derived works (the software that is made by altering the original) must retain the license of the original. 
From choose license depends whole access to project and to his source code, in strong copyleft there are three categories: 
  1. The GNU General Public License
  2. GPL version 3
  3. The Affero GPL
Each category has their own meaning, and some kind rules to use. The most suitable and by my opinion free to use, change and integrate is GNU General Public License. It contains the following rights: 
  1. The freedom to run the program, for any purpose (freedom 0).
  2. The freedom to study how the program works, and change it so it does your computing as you wish (freedom 1). Access to the source code is a precondition for this.
  3. The freedom to redistribute copies so you can help your neighbor (freedom 2).
  4. The freedom to distribute copies of your modified versions to others (freedom 3). By doing this you can give the whole community a chance to benefit from your changes. Access to the source code is a precondition for this.
Which basically means, you can do whatever you want with product under the copyleft license.
Main interesting part of these licenses, is that the code should be available for public, which leaves the door open for other users, developers and etc to update/modify software in best way.

Example of software that is under strong copyleft license is - Linux.


WEAK COPYLEFT 

Again, weak copyleft licenses have categories as well as strong copyleft, they are:
  1. The GNU Lesser General Public License
  2. The Mozilla Public License
  3. The European Union Public License
  4. Microsoft Public License and Reciprocal Public License
These licenses mostly have same GPL rights as Strong copyleft but the main difference between them is that weak copyleft refers to license where not all derived work inherit the copyleft license. Its inherit depends on how it was derived. Also weak copyleft licenses are mostly used for software libraries by allowing links to other libraries.

Example of software that is under weak copyleft license is - LibreOffice and OpenOffice

NON-COPYLEFT

If author wants no ownership he could just put work in public domain. Examples of non-copyleft free software licenses include the X11 license, Apache license and the BSD licenses. The X11 licence is used by the X Window System.

Which is most the most best deed for others.


ONLINE CONTENT

A Creative Commons license is one of several public copyright licenses that enable the free distribution of an otherwise copyrighted "work". A CC license is used when an author wants to give other people the right to share, use, and build upon a work that they have created.

Holds following categories:
  1. CC Zero (CC0)
  2. CC Attribution (CC BY)
  3. CC Attribution-NoDerivs (CC BY-ND)
  4. CC Attribution-ShareAlike (CC BY-SA)
  5. CC Attribution-NonCommercial (CC BY-NC)
  6. CC Attribution-NonCommercial-ShareAlike (CC BY-NC-SA)
  7. CC Attribution-NonCommercial-NoDerivs (CC BY-NC-ND)

Thus, if creator have an idea, that users or clients, should have rights to share, and modify piece of code and at the same time this code or software should be under some kind of copyright laws, he may use Online content licenses. 

Example of software that is under Online Content license is - Wikipedia.





















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