How to protect my idea by copyright? I have some idea of story, which I want to publish online (idea, not story, because it doesn't exist yet). I want people to discuss it and get some feedback from them. I asked question on worldbuilding.meta, but here I want to ask if I publish it on some website (for example discussion forum). How can I protect my idea from stealing?
You cannot. Ideas are not subject to copyright protection: see here. Your expression is subject to copyright protection, but if you intend to publish the expression (after you write it), you have to find a way to do so without surrendering your exclusive right, as you did for example with your question (read the TOS for Stackexchange).
There are three questions relevant to this issue: Who owned the copyright in the first place? Was the copyright transferred? If not, was a license given to the site to use the content? In general, under most countries' laws, the person who creates an original work owns the copyright. The person with the copyright has the right to copy and distribute the work, and the right to prevent others from doing so. In some cases, such as where a work is created as a "work for hire" by certain employees under certain circumstances, the initial copyright is held by a third party. You will need a lawyer familiar with your jurisdiction and your circumstances to determine if this is the case. Finally, even if you own the copyright, you can license others to use your content. This may be in an express written document, or it may be an implied license--implied, for instance, by the act of posting it on their blog. The existence and scope of such a license is, again, something that will have to be determined based on your country's specific laws and your specific situation. The bottom line is: if you submitted articles to that blog, you can't complain that they posted them. Depending on the license in effect, you might be able to get them taken down, or you might not. You need a lawyer, not the internet, to tell you what your rights are in this very specific case.
You would be in poorly-tested waters under US law. The invented name &quot;Cthulhu&quot; as appearing in a novel is not protected by copyright. A collection of invented names and other words assembled into a dictionary (e.g. of Klingon) might be found to constitute a copyright-protected creative work. In Paramount Pictures v. Axanar Productions (complaint), plaintiffs partially base their claim on infringement of language; defendants sought to dismiss the suit on various grounds (&quot;questions of law&quot; rather than questions of fact), but the court denied defendant's motion for summary judgment. Subsequently, defendants settled the case. Constructed languages are highly creative expressive works whose elements are deliberately selected for an artistic purpose, and they are not naturally-occurring facts. The copyright office has no position on copyright protection of a constructed language, and any such position would have to come from so-far non-existent (definitive) case law. The dismissal in Paramount v. Axanar doesn't clearly indicate that a constructed language is protected. The primary legal question would be whether the database that you copy into your system is protected. There is a colorable legal argument that a collection of language-like objects. The statutory language in 17 USC 102 does not specifically preclude protection of a wholely-creative database, and the copyright office does not say whether a conlang can be protected because the courts have not ruled one way or the other. The situation in Feist is very different from the case of a work which invents a language from nothing.
If any elements of the game are protected by copyright, then you cannot reproduce those elements (17 U.S.C. §106) unless your reproduction falls under a fair use exception (17 U.S.C. §107). Elements that may be protected by copyright include: artwork specific language on each card the aggregate effects of the cards (i.e. copying a single card's effects might not infringe copyright, but if you copy the effect of a bunch of the cards, such that you are taking expression of the original author's creativity, that might infringe, even if you change the words used) Whether an element of the game is protected by copyright is a fact-intensive question that would depend on the specifics of the game. Whether your copy infringes is likewise a fact-intensive question that would depend on what you copy. Fair use is also a fact-intensive, case-by-case analysis, but in my opinion, it is likely that creating a computer program derivative work (17 U.S.C. §101) of the game for your own personal education would be considered fair use. From a practical standpoint, even if it were not fair use, it would be near impossible for the copyright owner to discover. Posting the code on GitHub tips the scales away from fair use because of (17 U.S.C. §107(4)): "the effect of the use upon the potential market for or value of the copyrighted work." But, none of the factors are determinative on their own. You ask: I likely cannot simply change all the names of the various cards to something else, right? I agree. In my opinion, the selection and arrangement of the effects attributed to each card is an expression of the author's creativity, and no matter what you call the cards, copyright in the game would be implicated if you retained the effects associated with each card. If I start changing the rules of the game, does that make it legal for me to share my source code, for instance? At some point, it will be an entirely different game, so certainly, in the limit, your work would not be infringing. We can't answer where that line is, but in general, the less of the original author's creativity that you re-use, the less likely a ruling of infringement. Also, in general, the more transformative your work is, the more likely a fair use exception would apply.
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.
I'm pretty sure in France you have moral rights and copyrights. I am writing from New Zealand, but we have some similar intellectual property laws due to being member countries of the World Intellectual Property Organisation. We are also both member countries of the World Trade Organisation (WTO has the TRIPS agreement which relates to IP). So my answer may or may not be right &ndash; check what it says in France's copyright acts: you should be able to search for terms like first owner, and moral rights, films/videos, etc. The school isn't your employer, and so the basic rule is that you as the author are automatically the first owner. Since you're not really at school to create anything or research for the school, I don't think the court would enforce a blanket term that you had to agree to that the school owns intellectual property in what you create. You probably own the copyright. You also have moral rights in what you have created, which means even if the school does own the copyright in your work, you can request they attribute it to you if they show it in public (online). Not all works have moral rights. However, in NZ if you create a film/video you do have moral rights in it.
The creator of the derivative work has copyright in the derivative work. The copyright would protect only the new elements of the derivative work. Wikipedia is a good place to start. In the case of a book with updated grammar, depending on the extent of the changes, it would probably be easier to copy the original directly than to eliminate the updates from a copy of the derivative work.
I would argue that no, there is no copyright for the restored work. Independent copyright is only possible for any original material added, as previously discussed on this site. In this case, the added work was a technical process rather than a creative process, and technical processes cannot be protected by copyright. Copyright licenses would therefore be ineffective. However, I believe one could still impose a license based on owning the copy as opposed to the copyright (contract might be a better term in this case). However, if a third party managed to obtain a copy through some other avenue, any such contract would not be binding on them and nothing could be enforced against them unlike with copyright laws. Another way a license might be imposed is through patent protections, as technical processes can be protected via patents. However, I'm not as familiar with patent law, and this doesn't appear to be the claim being made.