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Licenses on Wiki

All textual content of is released under one of two licenses.

  1. All pages are released into the public domain
  2. All profile pages are released under the Creative Commons Attribution-Share Alike 3.0 Unported license (CC-BY-SA).

Both licenses allow anyone to re-use the content in any way they choose. This includes charging money for access to the content, distributing it wherever and however they like, and modifying it in any way they see fit. The main differences between the two licenses are:

  • If you alter CC-BY-SA content, your changes must also be released under the CC-BY-SA.
  • Any use of CC-BY-SA content must provide credit to the authors.

Note: This is a very basic comparison to highlight the main points. There are other differences that have not been mentioned here. Please seek proper legal advice if you are in any doubt about what you are and are not allowed to do with material released under either license.

Image-specific permissions are located on the images' description pages.

Considerations for public domain contributors

Please ensure that all contributions come from public domain sources. This means that either you have written it yourself, or you have copied it from another source that is clearly and unambiguously released into the public domain.

Most importantly, do not contribute content released under the CC-BY-SA or GNU Free Documentation License or any other 'open' license. It may appear that this is acceptable, because there is a certain amount of similarity between the licenses, but PD is not compatible with any other license in the way that the content with any other license can't be relicensed into PD (except that you are the author of the content). However, PD content can always be relicensed into any license.

Fair Use Policy

To be classed as fair use, an image must be:

  1. Non-free
  2. Irreplaceable – the image must be necessary to illustrate the subject and there must be no way to create a free equivalent
  3. Criticism, comment, news reporting, teaching, scholarship, and research
  4. Approved by an administrator

Section 107of the U.S. Copyright Law provides four factors to be considered in determining whether or not a particular use is fair:

  1. The purpose and character of the use, including whether such use is of commercial nature or is for nonprofit educational purposes
  2. The nature of the copyrighted work
  3. The amount and substantiality of the portion used in relation to the copyrighted work as a whole
  4. The effect of the use upon the potential market for, or value of, the copyrighted work

To be classed as fair use in terms of this site, an image must be:

  1. Non-free (defined as any image that is unlicensed, or has restrictions on derivatives or commercial use). Free-content images do not infringe any copyright, so they do not fall under the bracket of 'fair use'.
  2. Irreplaceable by a free content image. The image must be necessary to illustrate the subject and there must be no way to create a free equivalent. In the context of screen-shots, if you have followed the above guidelines then you should be OK.