19 votes

Can Wikipedia content be used on my website if I attribute it on my terms and conditions page?

You can use all the text, and most of the images, under some conditions, and those conditions include proper attribution. Wikipedias text is under the Creative Commons Attribution-Share Alike 3.0 ...
  • 9,026
13 votes
Accepted

How can I trust Wikipedia, if everyone can change it?

You are not supposed to trust it - Wikipedia itself tells you that it is not a reliable source. Instead, you are supposed to trust the sources it cites in the articles. This will mostly be secondary ...
6 votes
Accepted

Can I use Wikipedia's category tree in my website?

The categories (and their mapping) are under the same license as the other text on Wikipedia, which is Creative Commons Attribution Share-alike 3.0 Unported. So yes, just follow the license, and you ...
  • 178
6 votes
Accepted

Is it OK to use content from Wikipedia in an opensource project without attribution?

Commercial activities which infringe copyright don't become non-infringing simply by becoming non-commercial; that is, the commercial nature of your activity has very little bearing on its infringing ...
  • 39.7k
5 votes
Accepted

Wiktionary module code licensing

All content on Wiktionary is under CC-BY-SA 3.0 Unported, according to a link in the footer of each page. According to Creative Commons: Your contributions to adaptations of BY-SA 3.0 materials may ...
  • 4,002
5 votes
Accepted

JPEG comment to convey Copyleft Multi-Licenced Copyright Notice

You've got a couple issues. First off, is the way you assert your copyright. Particularly this: (emphasis mine) Copyright (c) 2016 my-name (ɔ) Copyleft The issue is that the term "copyleft" is ...
  • 6,259
4 votes

How can I trust Wikipedia, if everyone can change it?

Wikipedia has an entire article on this subject, including several studies, most famously Giles, J. (2005). "Internet encyclopaedias go head to head: Jimmy Wales' Wikipedia comes close to Britannica ...
  • 9,026
4 votes
Accepted

Proper use of Wikipedia code sample in open source projects

When merely copying small snippets of code, it may be worth considering whether the use could be covered by a copyright exception, such as fair use in the US. Because if some exception applies you won'...
  • 34.4k
4 votes

Proper use of Wikipedia code sample in open source projects

IANAL/IANYL, but provided you're happy with making your content available under GPLv3, you should be fine. You're planning on implementing the Wikipedia-provided pseudocode in other languages, which ...
  • 39.7k
4 votes
Accepted

Can an author of a GFDL content allow a publisher to publish a propietary derivative?

You hold the copyright to your works, and can issue licenses. A license can either be exclusive or non-exclusive, but for each sub-right of copyright you cannot grant an exclusive and non-exclusive ...
  • 34.4k
4 votes

Using code from Wikipedia

As Brandin said: if you copy the code verbatim, or copy and modify it then you have to follow the license. In this case you are advised to check the original sources since they may be licensed ...
  • 316
3 votes
Accepted

Where to find pictures for Wikipedia?

If not stated differently, websites contents (this including photos) must be considered copyrighted by the owner/maintainer of the website and you can't use them straight away. It is always a good (...
  • 399
3 votes
Accepted

Can a dataset built upon another have more restrictive license?

In general it is certainly possible, but "viral" licenses, such as the SA ("share-alike") CC licenses, require derived works to be provided under the same license, so the derived ...
  • 146
3 votes
Accepted

CC-BY-SA 3.0 and (A)GPLv3

The important point to focus on is that, with certain exceptions, the licence on a piece of software doesn't affect the outputs of that software. Instead, the outputs are generally a derivative work ...
  • 39.7k
2 votes

Wiktionary module code licensing

Nothing indicates that the Lua code would have a special license, you therefore have to assume that Wikitionary's default CC-BY-SA 3.0 applies. As your port is most likely an adaptation of that Lua ...
  • 34.4k
2 votes
Accepted

What exactly does "attribute the work in the manner specified by the author or licensor" mean in case of CC-BY-SA

The Creative Commons wiki best practices page suggests that a good attribution includes the title, author, source and license of the material. If there is no format specified you can't miss if you ...
1 vote

Where to find pictures for Wikipedia?

Most photos on Wikipedia (or Wikimedia Commons) are either created for that purpose, and thus licensed appropriately, or are found from Flickr, which allows and encourages users to add Creative ...

Only top scored, non community-wiki answers of a minimum length are eligible