Proportion of copyrighted material that can be distributed without infringement Is there a threshold or a descriptive proportion that is considered not copyright infringement but merely creative and educational use when distributing some copyright protected material along with your own material? Suppose a research team had a data set, and corresponding to each data point, had a large chunk of copyrighted text. What proportion of this text would they be able to release as preview or demonstration of the material without it being considered copyright infringement? I would like to cite Google Books, and the popular case of Google Inc. vs. The Authors Guild, where, under Google's book digitization project, they show certain subsections of the book to the general public for no charge, but argue that it is not copyright infringement.
There is no fixed amount or proportion of a copyrighted text which may be quoted without infringement. Whether quoting without permission is a fair use (which is what this question asks) depends on the totality of the circumstances, including the purpose of the use, the effect of the use on the market or potential market for the original, and the nature of the original work. In the Harper vs Nation case, quotes totaling roughly 300 words from the autobiography of former President George H. W. Bush (which was many hundreds of pages long) were held to be the "heart" of the work, and quoting them was found not to be fair use. There is no formula which can be rigidly or automatically applied to determine if a quote is a fair use. Note also that fair use is a strictly US legal concept, and a use which would be fair use under US law might well be copyright infringement under the laws of the EU, the UK, or other countries.
Whether published or unpublished, they are still protected by copyright. (They are probably unpublished for copyright purposes, but in the US this makes little difference for any recently created work (that is anything after 2002). For older work see the Cornell chart.) They cannot be copied or distributed without permission, unless an exception to copyright, such as fair use or fair dealing applies. And it is hard to see how either would apply to entire essays simply begin placed in a database. Placing text in a database is probably making a copy, and might be distributing it or publishing it, depending on how access to the DB is granted. Now data from the essays, as opposed to the texts of the essays themselves, are probably facts. Facts are not protected by copyright in any Berne Convention country, including the US, the UK, and the EU.
DMCA allows for a counter-notice. You can submit a counter-notice with a statement that you have a licence to distribute the content. Statements in the counter-notice about the facts relating to your permission to reproduce are under penalty of perjury. You could also sue the content owner to attempt to get an injunction against future takedown requests and you could get costs (not punative damages) awarded under 17 USC 512(f).
This falls within the penumbra of Feist v. Rural Telephone. The principle articulated there is that facts are not subject to copyright protection, but the expression of facts can be. Quoting from the ruling, "no author may copyright his ideas or the facts he narrates...however, it is beyond dispute that compilations of facts are within the subject matter of copyright". The distinction between protected vs. not protected hinges on originality: "The sine qua non of copyright is originality. To qualify for copyright protection, a work must be original to the author". But it is not sufficient that the work is created by the "sweat of the brow" of an author: it must possess at least some minimal degree of creativity. Thus "[t]he writings which are to be protected are the fruits of intellectual labor, embodied in the form of books, prints, engravings, and the like". As a concrete example, the ruling states "Census-takers, for example, do not 'create' the population figures that emerge from their efforts; in a sense, they copy these figures from the world around them...Census data therefore do not trigger copyright because these data are not 'original' in the constitutional sense." But, compilations of facts can be protected: Factual compilations, on the other hand, may possess the requisite originality. The compilation author typically chooses which facts to include, in what order to place them, and how to arrange the collected data so that they may be used effectively by readers. These choices as to selection and arrangement, so long as they are made independently by the compiler and entail a minimal degree of creativity, are sufficiently original that Congress may protect such compilations through the copyright laws An email list requires nothing more than brow-sweat, and even then, not much. A cleverly annotated and arranged email list would involve substantial creativity and would be subject to protection. That does not mean that you didn't sign some agreement that prohibits you from copying or using the list, but it isn't a matter of copyright.
This sounds completely incorrect to me. First, subsequent research is not normally a "derivative work" for the purpose of copyright, since copyright doesn't protect your ideas but only the particular form in which you have expressed those ideas. Second, as the owner of the copyright, you can permit anyone to make any sort of copy or derivative work, or sell, assign, or license the ability to do so to other parties, without regard to whether the work has been published. The real reason that nonpublication of your work would stifle further research is that researchers will not have access to it.
You can't, in general, know whether a distributor of a work has permission to distribute, or is a pirate site. I verified that they have posted an illegal copy of a work that I created, and I know that I did not grant permission to them (or anyone) to infringe my copyright. Both hosting and downloading works without permission is a violation of copyright law, so both parties are liable. Downloaders may erroneously rely on the "I didn't know!" defense, which in the US carries no legal weight. Even so, if you download my book, it will probably cost me vastly more to sue you for infringement than the damages that I might be awarded over your infringement. Usually, copyright holders go after the pirate sites, and only rarely go after particularly egregious serial downloaders.
It depends on what information you are sharing, how you got it, and what rights the business asserts over the information. For example, if it is content created by the business and they claim copyright protection you can only use it without their permission in accordance with Fair use exceptions. If you obtain the information through some limited/conditional access agreement you would be subject to the terms of that agreement. As always: If you want a legal opinion specific to your use case you need to consult a lawyer in your jurisdiction.
Expression is tied up with fixation. Copyright subsists in a work that is fixed in a tangible medium of expression from which they can be reproduced, perceived, or communicated. 17 USC 102 This expression is protected, not the idea. However, copyright infringement can occur even when there is not an exact copy. First, courts use a substantial similarity standard to determine if infringement has occurred. Second, when a character or plot is sufficiently developed, taking that character or that plot can be infringement, even if not expressed in the exact same manner. "We do not doubt that two plays may correspond in plot closely enough for infringement [...] the less developed the characters, the less they can be copyrighted; that is the penalty an author must bear for marking them too indistinctly." Nichols v. Universal Pictures Corporation, 45 F.2d 119 (2d Cir. 1930) Some characters or plot elements are so common to a genre that they are either not considered "original" enough to get copyright protection, or can be taken by others without being considered infringement. This is the scènes à faire doctrine. "Stock scenes and hackneyed character types that "naturally flow from a common theme"—are considered "ideas," and therefore are not copyrightable. But as plots become more intricately detailed and characters become more idiosyncratic, they at some point cross the line into "expression" and are protected by copyright." Suntrust Bank v. Houghton Mifflin Co., 268 F. 3d 1257 - Court of Appeals, 11th Circuit 2001 See Amanda Schreyer's An Overview of Legal Protection for Fictional Characters: Balancing Public and Private Interests for many more cases and examples of the idea-expression dichotomy in action with respect to fictional characters.