Can we use images from Wikimedia Commons in a product that we sell? Say we are creating an educational application that needs to use a number of images as part of its lessons. Since it would be prohibitively expensive if we had to hire an artist to create all the necessary images, would it be legal to use images from Wikipedia Commons in a product that we sell? This is their creative commons license, but it doesn't mention commercial product use.
Yes. The introduction to the license says &quot;You may adapt — ... build upon the material for any purpose, even commercially&quot;. (My emphasis). Note that there is an attribution requirement so you need to find a way to attribute each image to its individual author. For the fine details, you certainly need to read the actual license (rather than the introduction) and you probably need to consult your own, paid-for, IP lawyer - but if you are just scoping the project out at the moment, you should be fine. For contrast, here is a Creative Commons licence that does prohibit commercial use.
License to use does not mean license to create derivative works These are different rights under copyright. If you want to make a derivative work, which your animations are, you must have a license to do so.
You are required to provide a copyright notice on your work, such as putting (c) rhino 2016 in the liner notes. Nothing precludes you from licensing that copyright in any way you want, such as Creative Commons. As long as you aren't in violation of the last sentence (your work is not primarily the samples, and you actually made a song with them), then others should be able to use your work with no restrictions other than what you yourself place on the work. The purpose of requiring a copyright notice on derivative works is to give notice of who the actual author is and distance the original author from the derivative work. If you take their samples and make a song that is later at the center of a lawsuit (copyright, defamation, etc), the the copyright notice will hopefully steer people first to the derivative author and not the original author. That is the purpose of the clause in the copyright grant above.
At the bottom of every edit screen on Wikipedia, above the "save page" button, it says: By clicking the "Save page" button, you agree to the Terms of Use and you irrevocably agree to release your contribution under the CC BY-SA 3.0 License and the GFDL with the understanding that a hyperlink or URL is sufficient for CC BY-SA 3.0 attribution. If you are asking for technical details on how to show that on a MediaWiki installation, that question could probably be better asked at another site. Regardless, on a standard MediaWiki installation, that text may be found and modified at the [[MediaWiki:Copyrightwarning2]] (sometimes [[MediaWiki:Copyrightwarning]]) page of the wiki.
Generally, no, this will not violate copyright. Your end user might violate copyright, but that is their problem not yours. Your program is a tool, just like a word processor is. If I copy a Harry Potter book into a word processor that does not make the word processor maker liable. There is a concept of "contributory infringement", which I think is what you are concerned about. I don't know about Danish law in particular, but most countries would require evidence that you had reasonable knowledge that actual copyright violation was occuring, rather than just being aware that it might happen in theory. This is normally applied to file sharing services who have to have "notice and takedown" measures, file filters and the like. This isn't your concern as you never have any access to the files created by your users. You can also be found liable if you induce anyone to commit copyright violations. Don't draw your customers attention to the custom monster feature as a workaround for those copyrighted monsters, as that could be considered to be inducement. Also don't provide any "wizards" or similar tools which make it noticeably easier to duplicate the custom monsters (e.g. if you notice that the copyrighted custom dragon stats are all on a linear scale with dragon size, don't create a "dragon creation wizard" embodying that fact.) This assumes that your program runs entirely on the end user computer. Its different if you provide any kind of cloud storage for generated characters.
"Doing the same thing" is very common. We even have names for certain categories of websites, such as "web shop" and "blog". Such concepts are not protected in general. Obviously, you can't copy the name of existing webshop, or their logo, but things like a "rectangular layout of products for sale" aren't original. There is of course a grey area here, because there's a continuum of similarity. In general, similarities that follow from technical justifications are acceptable (having an upload button is sort of the point for your website), similarities that are cosmetic only (same color choice) might be interpreted as intentional attempts to cause confusion.
Yes, that’s allowed. Under the Stack Exchange terms of service, content you upload is licensed to Stack Exchange Inc. on a non-exclusive basis under CC-BY-SA 4.0. The terms of service do not give Stack Exchange the copyright to your contributions, and a non-exclusive license means you are not promising Stack Exchange that “only Stack Exchange will be allowed to use this content.” That means you can continue to do whatever you want with your own content and do not need to mention Stack Exchange at all. The only restriction is that you can’t stop Stack Exchange from continuing to use your Stack Exchange content under CC-BY-SA 4.0, and since it’s a Creative Commons license you also can’t stop anyone else from using your Stack Exchange content under that license.
No These are derivative works and making them is copyright breach. Doing this as a hobby or even for the entertainment of friends in private is likely fair use. Distribution or performance in public (monitored or not) is likely not fair use and you would need a licence. Here is a summary of the relevant law in australia.