can I make a simplified version of another existing web app? I want to produce a much simpler web app inspired by a more complex web app, with some additional features of my own. The original web app was inspired by a process in general knowledge. From this page, I see that: My own web app's &quot;work is considered original – and thus protected by copyright – if you use your skill, labour, judgement and effort to create it. Using another’s work is copyright infringement when ‘the work as a whole or any substantial part of it’ has been copied.&quot; I understand that The meaning of ‘substantial’ changes is defined on a case-by-case basis. Given the original app's central process is inspired by general knowledge, and I am using a much simpler version or process than the original web app and adding my own features, would my own web app break copyright? Help appreciated.
The idea for an app is not subject to copyright. Only the artifacts of the app itself (sourcecode, images, texts, sounds, etc.) can be. So if one only copies the idea and creates their own version of all the other assets, then they are not violating copyright. However, in some cases, ideas can be subject to patents. But patents on software are tricky. First of all, only new ideas can be patented. When a supposed new idea was already published before, then that's called &quot;prior art&quot; and you can not patent it. Then getting a patent means a lot of investment in money and time (which is very different from copyright which you get automatically the moment you make something copyright-worthy). So not everything that could theoretically be patented gets patented. And then, many jurisdictions do not recognize software patents at all, and those which do have different limits on what is and is not patentable when it comes to software. This means patents are rarely a concern when copying the app idea of someone else, but not never. And another possible concern is the third pillar of intellectual property: Trademarks. This protects the name of the app. Trademark law oversimplified forbids to create a competing product with a name which might confuse customers. So if you created StevesSuperCoolAppForCoolPeople and I create StevesSuperCoolAppForCoolPeople - Simplified Edition, then I would be violating your trademark, because my product name sounds as if it was your product, when it is in fact an unrelated product with a similar purpose.
The general rule under united-states law is that copyright is infringed when a copyrighted work, or any part of it, is copied or distributed without permission, or a new derivative work based on the copyrighted work is created or distributed without permission. There are several exceptions to this. There is, for example, a specific right to create a backup of a computer program to which one has lawful access. The best known and widest exception to copyright in US law is &quot;fair use&quot;. What use is a fair use is a highly fact-driven question: It cannot be answered in general, except by quoting the statutory provisions. There are no exact rules for what is and is not fair use that apply in all cases. There have been several detailed discussions of fair-use on this site, including https://law.stackexchange.com/a/66608/17500 not long ago. Note that fair use is a strictly US concept, and does not apply under any other country's law. Other countries have their own exceptions to copyright, which will cover some of the same cases as fair use, but not all of them, and will get to results by different routes. If hashes were distributed separately, to confirm the authenticity of a program, they would probably not be protected by copyright for lack of originality. Under US law, and particularly the Feist Publications, Inc., v. Rural Telephone Service Co., 499 U.S. 340 (1991) case there must be a &quot;minimal degree&quot; of creativity for something to be protected by copyright. The decision said: Many compilations consist of nothing but raw data—i.e. wholly factual information not accompanied by any original expression. On what basis may one claim a copyright upon such work? Common sense tells us that 100 uncopyrightable facts do not magically change their status when gathered together in one place. ... The key to resolving the tension lies in understanding why facts are not copyrightable: The sine qua non of copyright is originality. Since a hash or other digital signature can be computed automatically from the document to be signed (indeed that is its value), it is not creative and copying a hash alone would not be an infringement. Whether this would be true of other metadata depends on the exact nature of that data, and the degree of creativity that it represents. Without specific facts no judgement can be made, and making that kind of very specific judgement might be beyond the scope of this site. A comment said: Just because a work is copyrighted, doesn't mean every part of that work is copyrighted, ... I would put it that every part of a work is copyrighted, but some copying does not amount to infringement. Extracting facts and rewording them so that none of the expression is copied is not infringement. Extracting a completely non-creative part of a work and reproducing it is not infringement. Copying a limited amount for use in a review or commentary is often fair use, and fair use is not infringement. Video Games There is nothing in US law specific to video games. There is little that is specific to computer software, although the right to make a backup copy is protected. A good deal of case law has focused on the issue of temporary copies made while running a program, which does not seem relevant to this question. Other cases have focused on the protectability of user interfaces, and of APIs, also not relevant here. whether a work is packaged as a single file or as many related files should not affect its copyright protection. (I know of no case on that specific issue.) Whether copying a part of acomputer file is infringement or not would depend on the purpose of the copying, and on the effect or potential effect on the copyright holder, and perhaps on other factors. Copying a non-creative hash, as a way of detecting whether a file is modified or not, does not seem likely to be infringement, unless the holder could show harm, but no one knows for sure how a court would rule in such a case. Copyright does not protect facts, but it does protect the way in which facts are expressed, unless there is only one or a few such ways available to express such a fact. Copyright also may protect the selection and arrangement of facts, except where the arrangement is &quot;obvious&quot;. Placing facts in alphabetical order (as in a phone book) or chronological order (as in a timeline) has been held to be obvious and not protected. International Standards The question and a comment ask about international standards for copyright. In effect there are none. The only significant international agreement on copyright is the Berne Copyright Convention. That is a treaty to which almost every nation belongs, thus rendering the Universal Copyright Convention and other international copyright agreements obsolete. But the Berne Convention leaves details to national copyright laws. The making or authorizing of copies, and the authorizing of derivative works are part of copyright in every Bern-compliant country. Berne provides for exceptions to copyright, but leaves the details to national law. Moreover, there is no intentional court in which copyright claims can be made. Anyone wishing to sue for copyright infringement must do so in the courts of some specific country, and so all the case law which defines details on what is and is not infringement is national, not international. It should be noted that a copyright holder may sue in any country where infringing actions have occurred. When an allegedly infringing work is distributed over the web, that often means that a plaintiff may sue in almost any country, although enforcement will be limited if the defendant has no presence and no assets in the chosen country. Thus the copyright laws of multiple countries may be relevant to a particular case.
Makerbot's explanation of the Terms is accurate This is comparable with most other services that host and display User-created content - even with SaaS providers, as per Interpretation of content ownership/usage in service provider agreement. They are correct that they are asking for the lots of broad rights, but it's all qualified with (my emphasis): 3.2 License. You hereby grant, and you represent and warrant that you have the right to grant, to the Company and its affiliates and partners, an irrevocable, nonexclusive, royalty-free and fully paid, worldwide license to reproduce, distribute, publicly display and perform, prepare derivative works of, incorporate into other works, and otherwise use your User Content, and to grant sublicenses of the foregoing, solely for the purposes of including your User Content in the Site and Services. That is, if they use your User Content for a purpose other than including it in the Site and Services (and you have not agreed to this use), you may be entitled to relief in the form of an injunction or damages.
Copyright infringement requires that you actually copy elements from an earlier work produced by a different author. If you created a similar, or even identical, work independently, it is not copyright infringement. When considering whether or not infringement has occurred, the court is likely to consider whether the defendant could reasonably have had access to the plaintiff's work. If the court finds that they could have, then the defendant would be required to produce evidence of original authorship. Consider the My Sweet Lord/He So Fine case, where the court found the defendant had subconsciously copied the plaintiff's song. Had Harrison been able to produce evidence of original authorship, the judgment could have been different. In your example, it is unlikely that an suit in copyright infringement could be decided against you, as you've stated the text is generated randomly. However, more evidence of this randomness might be required to support your case. Of course, whether a computer or automated process can produce works independently is still questionable; I'm not aware of cases that have tried this. The US Copyright Office has said that Works produced by mechanical processes or random selection without any contribution by a human author are not registrable. Of course, whether this has a bearing on your particular scenario is undecided, and I'm not sure how it would be decided. It is almost certain that the worst case outcome would be an injunction requiring you to cease publicising the product, or perform reasonable checks prior to publication to ensure that the product of your program infringes on works; it would be unlikely that you would have costs ordered against you, especially if the program is truly random, and the random text was given as much, or more, publicity than the coherent text.
The web-browser game was copyrighted the moment it was created by the individual. It did not need a copyright notice to be copyrighted, or a TOS to inform you of copyright. The individual was fully within the law to claim infringement and demand you stop disturbing your mod as an unauthorized change to their game. They should have had a TOS up when they started distributing the game, but that's their choice. The developer could - or have their attorney - send their own legal "takedown notice" of infringement directly to you rather than Tweet about it or approach Google. Google's takedown and your "copyright strike" is different than your original copyright violation and involves Google's TOS - Google Chrome Web Store Developer Agreement | Google Chrome - regarding copyright violations of apps and code under distribution. By your use of the store, Google reserves the right to remove your extensions when there are ...violations of intellectual property rights, including patent, copyright, trademark, trade secret, or other proprietary right of any party,... And, the original game being free and your mod being free rarely matters in copyright law and in cases of infringement. That's something a court would decide on the case and in looking at precedent(s). ...can I get into legal trouble for this? You could be sued by the maker of the game in civil court; that's up to them. Google's recourse is to simply remove the mod from the store and possibly restrict your use of their service(s), according to their TOS. For more background, see the Law SE Meta post I have a question about copyright. What should I read before I ask it? .
Ideas are not subject to copyright protection. See 17 USC 102: In no case does copyright protection for an original work of authorship extend to any idea, procedure, process, system, method of operation, concept, principle, or discovery, regardless of the form in which it is described, explained, illustrated, or embodied in such work If you want protection, keep your ideas to yourself and create a concrete expression in the form of a program, which is protected by copyright.
Recipe books can be, and often are, protected by copyright. If the individual recipes are by others, this would constitute a collective work or compilation. See this recent answer for more on the rights protected for a collective work. The selection of which recipes to include would be a creative element, protected by copyright, and could not be copied or closely imitated without permission. However, division into groups by type of dish would be a &quot;natural and obvious&quot; arrangement, and not protected. So would alphabetical or chronological arrangement within a group, or over all. A &quot;non-obvious&quot; order of recipes would however be a protectable element. An individual recipe may be protected by copyright, but this protects less than one might think. Copyright does not protect facts or methods. This means that the list of ingredients is not protected, nor is the general list of steps of preparation. Only the exact wording of the recipe will be protected. Creating a new collection of recipes based on several different previously published collections of recipes (whether from the web, books, magazines, or other media) and making one's own selections of which ones to include that is significantly different from any of the previous collections would not violate the collection copyrights of any of the previous collections. If the actual recipes were rewritten so that any creative expression from the originals was not copied, then it seems that no copyright infringement has occurred. Most recipes, after all, are not fully original but are modified from older ones. There is no set figure for how many recipes could be copied from a given source before this becomes infringement. That would be, if a suit was field, a matter for the judgement of the count as to whether the new book was &quot;based on&quot; the alleged source. The more the list in the new work resembles a particular source, the more like a derivative work it seems and the more likely that it would be held to be an infringement. One could always ask for a license from the older source, to avoid any risk of suit, but it might not be available or the copyright holder might demand an excessive fee. Asking for a license risks drawing attention to the new work, as well, and might cause a holder to file suit who otherwise would not.
The code is copyrighted. You are not given any permission to use or copy any part of it, nor to create a derivative work based on it. There is no way for you to "make the copyright null". The code was copyrighted in 2005, and the copyright will not expire until 70 years after the death of the author, under US law. The period would vary in some other countries, but in no country that I know of will it expire in the next few years. That the author is dead, or the publisher out of business, does not change this legally. Someone, probably the author's heir, or perhaps whoever bought the remains of the publisher's business, will own the copyright. However, the ideas and programming techniques shown and discussed in the book are not protected, and you may use them freely to write programs, commercial or non-commercial. You need not even acknowledge the book as a source of ideas, although to do so would be nice. Of course, since the author is dead and the publisher not active, if you were to infringe the copyright by copying code from thsi book, there is a reasonable chance that no one would notice, but if someone did notice, the current owner of the copyright could sue you for infringement, and could perhaps win sizable damages. It would be safer to write your own original code using only the general ideas from the book. In future, do not ever assume that you can just take someone else's code (or other creative work, such as a book) and reuse it without permission, unless it is in the public domain, for example because it was published before 1923.