Questions tagged [cc-by-sa]

For questions about the Creative Commons Attribution-ShareAlike (CC BY-SA) licenses.

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77 votes
2 answers
15k views

Why is CC BY-SA discouraged for code?

Everybody knows that you shouldn't use a CC BY-SA license on your code. Even the Creative Commons folk recommend against it. What I don't know or understand is why. I can't seem to find any ...
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  • 4,988
28 votes
3 answers
2k views

What do I need to share if I include CC-BY-SA artwork in my software?

CC-BY-SA is a Creative Commons license with a copyleft clause - if you derive something from it, you must also provide the derivative under the same license if you distribute it. The relevant clause ...
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  • 8,463
36 votes
6 answers
3k views

Can I copy-paste a snippet from Stack Overflow into my GNU-GPL project?

I have found on Stack Overflow a 10-lines block of code that does exactly what I want. There is no license information in the post nor on the answerer's profile page, so the CC BY-SA 3.0 license of ...
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14 votes
2 answers
840 views

Does the CC-BY-SA License require that source code of derivative works be shared?

For example, if I create a LaTeX file and license it with CC BY SA, can someone create a derivative work, but only publish the PDF, without giving out the derived LaTeX source code? Does this fall ...
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11 votes
2 answers
567 views

What counts as adaptation for using code licensed under CC BY-SA 4.0 in software licensed under GPLv3?

Since 2015-10-08, GPLv3 is listed as one-way compatible license for CC BY-SA 4.0: […] you may license your contributions to adaptations of BY-SA 4.0 materials under GPLv3, but you may not license ...
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  • 5,300
5 votes
1 answer
229 views

Must CC BY-SA be included for ideas and code taken from Stack Overflow?

I'm still unclear about licensing. If I have a project on Github that's licensed under GPL and found pseudocode on a Stack Overflow question, must I now dual license my code on Github and GPL as ...
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65 votes
2 answers
3k views

Relicensing content under CC-BY-SA

I have compiled a body of work from numerous contributors, who all licensed their individual works to me under CC-BY-SA version 3. Can I now instead redistribute their work under CC-BY-SA version 4?
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12 votes
2 answers
871 views

Can I use GPL v3 for source code and CC BY-SA v3 for comments?

I have some source code for which I am the copyright holder. I want to release it under the GPL, but when it was closed source, I copied a bunch of a stuff from Wikipedia for a couple of classes and ...
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6 votes
1 answer
192 views

A non-bloated license for documentation with the benefits of GPL?

In response to one of the FAQs, FSF has noted: It is possible to use the GPL for a manual, but the GNU Free Documentation License (GFDL) is much better for manuals. The GPL was designed for programs; ...
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  • 1
6 votes
1 answer
237 views

In which cases must I relicense my product under the CC BY-SA license?

Because copyright law can encompass a huge range of scenarios and be unclear to talk about in abstract terms, I'm going to give concrete examples. I understand CC BY is a permissive license. All it ...
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  • 161
3 votes
1 answer
283 views

Using Wiktionary data in mobile app

I'm planning a language app for mobile devices using data from Wiktionary. I'm planning on web-scraping the content and compiling it into a database that I'll package with my app. Most Wiktionary ...
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  • 155
20 votes
2 answers
2k views

Can I "upgrade" the version of CC BY-SA from 3.0 to 4.0 in my modification?

What I'm doing: I'm adapting a work licensed under CC BY-SA 3.0 Unported license to a different language. I'm indicating the original work and its license. I'm indicating that I have made changes to ...
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  • 1,329
18 votes
1 answer
402 views

Do Stack Exchange’s ToS mean that the user-generated content is double-licensed to them?

In the ToS of Stack Exchange sites, under the section Subscriber Content, the first sentence states that my submitted content is licensed (to Stack Exchange) under CC BY-SA 3.0: You agree that all ...
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  • 5,300
8 votes
2 answers
218 views

Can I adapt a CC-BY-SA licensed webpage to host rights-reserved copyrighted content?

I think the inverse of What do I need to share if I include CC-BY-SA artwork in my software?. Some webpages, such as Code for America are licensed under CC-BY-SA. If I want to adapt the code for this ...
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  • 191
5 votes
1 answer
299 views

How can I use programming documentation without infringing copyright?

I have a really hard time understanding how can I use copyrighted programming documentation, tutorials, articles, blogs, etc. presented as text or video, without infringing copyright? I will explain ...
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  • 173
4 votes
1 answer
343 views

What is the exact definition of an Adaptation under Creative Commons?

The text of the CC-BY-SA 3.0 license mentions the following: You may Distribute or Publicly Perform an Adaptation only under the terms of: (i) this License; (ii) a later version of this License ...
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1 vote
1 answer
888 views

Can I use data licensed under Creative Commons for closed source propriety software?

I am interested in using data distributed under the Creative Commons Attribution-ShareAlike 4.0 (CC-By-SA) license. A subset of it can be extracted, which will fall under a Creative Commons ...
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14 votes
1 answer
495 views

Selling a book based on CC BY-SA

My company would like to make a book mostly adapted from CC-BY-SA licenced text. I understand this is legal if we distribute the adapted text under the same licence. But what if we add to the book our ...
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12 votes
1 answer
308 views

How does re-licensing without the approval of authors work (eg, wikimedia case)?

Wikipedia (and any other Wikimedia product) change to a dual licence since 01/08/2009. As I understand, that implies they redistribute GFDL licensed text in CC-BY-SA without asking every author (wich ...
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  • 253
7 votes
1 answer
1k views

Creative Commons license CC BY-SA doesn't work for commercial content?

I'm puzzled by the "share-alike" clause in Creative Commons license. This license allows free commercial use but "require[s] [] adaptations of the work to be released under the same or similar license ...
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  • 561
5 votes
1 answer
142 views

How could I copyleft a document that contains a substantial amount of both code and prose?

I am writing a document in LaTeX that contains large sections of Python code and output. Typically, I like to license my writing under CC BY-SA 4.0 and my code under GPLv3. I have already placed a CC ...
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4 votes
2 answers
101 views

Using modified CC BY-SA 4.0 images in app?

I am building an application and I want to use OpenMoji in it, but with modified colors. Firstly, I wanted to add All emojis designed by OpenMoji – the open-source emoji and icon project. ...
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3 votes
1 answer
2k views

Can I sell charge a code that link/use a library released as Attribution-ShareAlike 4.0 International CC BY-SA 4.0?

I wrote a code that use a library release under CC BY-SA 4.0 (Attribution-ShareAlike 4.0 International). As far as I understand, if I cite them and release the source code as well with my code I can ...
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  • 151
1 vote
1 answer
169 views

How do Wikipedia licenses, CC-BY-SA and GFDL differ?

Wikipedia licenses most of their text and images under two licenses, CC-BY-SA and GFDL. We can choose either of the licenses while using the work. I know both of them are copyleft licenses and ...
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  • 347
5 votes
1 answer
228 views

Using CC-BY-SA images in a CC-BY-NC-SA document

I am creating a presentation that includes some unmodified images licensed under either CC-BY, CC-BY-SA version 2.0, 3.0 or 4.0 (no CC-BY-SA 4.0) and some public domain images. They are all attributed....
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4 votes
1 answer
298 views

Using CC BY-SA music in a podcast

We've just started a podcast and we're not sure which license we will give it. Might be CC or public domain, for now we keep it to the default (all rights reserved). The podcast is about 20 minutes ...
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2 votes
1 answer
264 views

Using code from Wikipedia

I have some code for an algorithm that is published on Wikipedia. Can I use that code in a commercial software? Or would this mean that I would introduce a viral license and would have to share my ...
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  • 141
2 votes
1 answer
274 views

Can I include an image covered by CC Attribution-ShareAlike 4.0 in a deck for a paid online course?

I would like to include this picture from Wikimedia into a deck that I am using to film a paid course on Udemy. The image was created by Elizabeth Goodspeed and covered by CC BY-SA 4.0 While I ...
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  • 23
2 votes
1 answer
160 views

Can I embed proprietary content in a CC BY-SA website?

I would like to build a free open-source copylefted personal website under the Creative Commons Attribution-ShareAlike license (or a similar such license). However, I would like to still be able to ...
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1 vote
1 answer
93 views

What is the correct way to add a CC BY-SA 4.0 license to the assets in a project already licensed under GPLv3?

These assets would include images, sounds, and anything else in the project besides the source code. I own the copyright to these assets. To be clear, I'm asking how I would actually apply the ...
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  • 111
1 vote
1 answer
97 views

Is there an official guideline from Creative Commons on how a CC-BY-SA 3.0 website could "upgrade" to CC-BY-SA 4.0?

It looks like Creative Commons only allows a relicensing from CC-BY-SA 3.0 to CC-BY-SA 4.0 for derivative works: You may Distribute or Publicly Perform an Adaptation only under the terms of: (i) ...
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