Is it legal to print pirated pdfs? I mean if someone pirated some books and print them and then sold them to us (without informing us that these books were pirated printed books), is there any lawsuit threatening us?
Your title and your question are totally different. If someone pirates a book, makes printed copies, and sells them for profit, that's the point where it switches from plain copyright infringement to being criminal copyright infringement. Which means jail instead of paying damages is possible. If you buy one of these printed copies, not knowing that they have been created illegally, and not being willfully ignorant that the printed copies were created illegal, then you didn't commit copyright infringement yourself. Since you are asking the question, it's obvious that you now know that there was copyright infringement, and buying any more copies would be encouraging copyright infringement with no excuses for you. You can be sued for damages. It is unlikely to happen since suing takes likely more effort than getting any damages from you is worth. The correct thing to do is ask the seller for your money back and destroy the copies. If they don't refund your money you can inform the copyright holder.
You automatically have a copyright in any copyritable things you create. So you own copyright over the pictures you sent him (as long as you created them)
A few years ago, there was a trial in the USA about some short sound on some music CD: One party claimed that one piece of music on the CD contained a sound of less than one second length which is copied from another CD without the permission of the copyright owner of the other CD. It could never be found out if this claim was really true. The court's decision was: If it is not possible to distinguish between a copy and a work that does not depend on the other work at all, it is not a copyright infringement - even if the sound has been copied from the other CD. For this reason, I'd guess that a 4x3 image would not be a copyright infringement, yet, while 60x45 would definitely be one. Just for reference: The same image as 3x4 and as 45x60:
This may well be infringement, but I agree that you should start by reaching out to the instructor. You don't want to pay a lawyer if the matter can be be adjusted peacefully. In the US there is a special limited exemption to copyright for "use in classroom instruction" which might apply in such a case. I am not sure if there is a similar provision in Canadian copyright law. But the instructor is likely to change his practice if you notify him of your objection, even if he has the technical right to use the photo. At least it is worth finding out. If he won't, then you can always consult a lawyer.
In a hypothetical case like you are describing, you could make a contract with them regarding the duplication of the content, irrespective of copyright law. Their violation of that contract would not necessarily be a copyright violation (which would allow statutory damages), but you might win a breach of contract lawsuit. But if someone took it from them and made copies, you would likely not have a case against that person because copyright would not protect you and you have no contract with them. In addition, you could obtain a very "thin copyright" in a particular new presentation of the material. This would mean that copyright law would apply, but only to the particular presentation (e.g. new footnotes, a particular layout, etc...) If considering doing this IRL, you should consult a copyright attorney.
are there any safeguards you could take to preemptively block such behavior, such as a disclaimer inside the book cover that reads something like The safeguard you outline would be overridden as soon as the author enters any contract that requires assignment of copyright. (I would not delve in the differences between licensing and copyright assignment because that hypothetical author is dealing with a contract of adhesion which readily requires assignment; the author has no option to change the ToS to allow for licensing only) Under contract law, one of the essential prerequisites is that the conditions of a contract be entered knowingly and willfully. By deliberately clicking on a ToS page to move forward with the uploading a copyrighted work, the author is signaling his awareness and acceptance of the ToS. The fact that the author chose not to read the ToS is irrelevant and very unlikely to strike whatever entitlements the website owner formulated in the accepted ToS. For the same reason, the author's safeguard disclaimer does not bind the website owner: It cannot be said that the website owner was aware of that disclaimer at the time of the formation of contract between the author and the website owner. That is, the website owner did not knowingly and willfully accepted the author's safeguard. The website owner is not even expected to know about any safeguards which one of its potential user intends to establish. The length of a ToS document is also irrelevant because the website owner has the valid argument that "the user-author could have skimmed through the ToS or do a search (via Control-Find) of keywords such as 'copyright' or 'property', whence any allegation of 'inadvertent' assignment of copyright is untenable". Is there a way to protect your IP from inadvertently being licensed/stolen/assigned via TOS "agreements", without having to waste your life reading huge one-sided online "contracts" that are "subject to change without notice" anyway? Yes. That consists of not uploading one's works in such platforms. In contract law that would be expressed as "declining an exchange of considerations". There are many other alternatives for an author to promote his work without being required to assign copyright.
It is legal to rewrite a book that is out of copyright, although ethical considerations demand that the original author and source be credited. You need to derive your rewrite from a version that is out of copyright, however, rather than a translation whose incremental innovations due to the transformation arising from the translation is still under copyright. Certainly, the 16th century original would be out of copyright, and in all likelihood, so would many of the later editions, but probably not the one from 1971.
Physical content The main consideration with physical content is that reading it does not require making a copy, so uncomplicated copyright law is what’s relevant. Copyright law is about making copies (also distributing). Purchase a novel (a physical book which was legally obtained). There is no copying involved (you do not in fact make a copy in your mind, if you're a human). Under the First Sale doctrine, once a copy is sold by the rights-holder (e.g. the publisher, initially to the bookstore or distributor), that owner can do whatever it wants with that specific copy, including reading or re-selling (and anying thereafter can likewise). Books are sold, not licensed. Copyright relates to copying, not reading. It’s true that all (legal) rights are reserved, but the power to prevent resale is not a right. Book (or anything else) on the ground. As above, with the complication that you aren’t at least immediately the rightful owner. But, you don’t have to be the owner of a protected work to read it (otherwise libraries would not exist). The rightful owner might unsuccessfully try to sue you for reading their property, but reading does not cause damage, and your act is innocent (not even negligent), and not wrongful. Eventually (depending on jurisdiction) you may become the owner if the original owner does not reclaim the book. Reading a copy made by someone else. See above about the relationship between reading and copyright. The teacher might maybe be liable for infringement, but you are not culpable (assuming you didn’t encourage the teacher to make an illegal copy). Digital content However, every item of digital content has to be copied many times, in order to actually be read. E.g. a copy is made to video display memory from RAM, which is copied some number of times from RAM to RAM as the program formats and sizes, ultimately reading a copy stored on disk storage (which is installed from.... using N temp files) Typically what happens is that you acquire a copy of a license to use the content. Some number of copies may be statutorily permitted, e.g. the myriad transitory copies created across the internet as you download the work, or on your computer as you install it. The law addresses this matter in part at 17 USC 117, saying that it is not an infringement for the owner of a copy of a computer program to make or authorize the making of another copy or adaptation of that computer program provided: (1) that such a new copy or adaptation is created as an essential step in the utilization of the computer program in conjunction with a machine and that it is used in no other manner, or (2) that such new copy or adaptation is for archival purposes only and that all archival copies are destroyed in the event that continued possession of the computer program should cease to be rightful. Since Congress chose the word “program” rather than “file”, the plain reading of this is that permission is always required to read digital content. One may assume, when you purchase an electronic book at the store (you thus own the recording medium), that the work also comes with specific permission to make those automatic copies required to actually read the book on a computer. In order to read the book you must make some number of copies. Seeing stuff on a web page. Let’s also assume that the material is on the page without permission, but you don’t know that, and it just jumps out at you. This raises an interesting question regarding statutory language and web pages. The statutory language is not at all clear about link-clicking (the statutes don't say anything about "links"), and I don't know of any relevant case law (probably because it would be ludicrous to go after an innocent link-clicker) Infringement is defined in 17 USC 501(a): Anyone who violates any of the exclusive rights of the copyright owner as provided by sections 106 through 122 or of the author as provided in section 106A(a), or who imports copies or phonorecords into the United States in violation of section 602, is an infringer of the copyright and if you infringe, you may be liable. 17 USC 106 spells out those rights: the owner of copyright under this title has the exclusive rights to do and to authorize any of the following: (1) to reproduce the copyrighted work in copies or phonorecords; … (3) to distribute copies or phonorecords of the copyrighted work to the public by sale or other transfer of ownership, or by rental, lease, or lending; … When you go to a web page and click a link, are you reproducing the protected material? Or is the website owner reproducing the material, and pushing it onto you? I don’t know of any decisions that address this kind of technical question. There is no question that the person hosting the infringing material is liable, the question is whether you would be as well? It would be highly unjust to hold the innocent link-clicker responsible. There is a bit of protection for innocent infringement in 17 USC 405(b) Any person who innocently infringes a copyright, in reliance upon an authorized copy or phonorecord from which the copyright notice has been omitted and which was publicly distributed by authority of the copyright owner before the effective date of the Berne Convention Implementation Act of 1988, incurs no liability for actual or statutory damages under section 504 for any infringing acts committed before receiving actual notice that registration for the work has been made under section 408, if such person proves that he or she was misled by the omission of notice. In a suit for infringement in such a case the court may allow or disallow recovery of any of the infringer’s profits attributable to the infringement, and may enjoin the continuation of the infringing undertaking or may require, as a condition for permitting the continuation of the infringing undertaking, that the infringer pay the copyright owner a reasonable license fee in an amount and on terms fixed by the court. (c) Protection under this title is not affected by the removal, destruction, or obliteration of the notice, without the authorization of the copyright owner, from any publicly distributed copies or phonorecords. (You could be prevented from further use of the infringing material, and liable for specific lost profit). Infringement is not defined in terms of what you know or believe about the copyright status of work. Nevertheless, I would expect that in addressing the question of whether a person had in fact made a copy that they would look at the mental state of the individual, looking for mens rea. This could distinguish clicking a link that unexpectedly pushes protected material onto you, versus attempting to obtain protected material by clicking on a link.