Is it piracy to obtain software you purchased in an alternate way? Lets say you purchased software in the 90s or early 2000s, but lost the license key and or the disc. Another possibility is the company is no longer supporting and or does not provide older versions of its software. What you do have: the receipt with your name on it. the box from over 15 years ago. a statement from your bank proving it was purchased with a credit card with your name on it with the same date as the receipt. The computer with this software crashes and the license key is lost in a unrecoverable hard drive. In layman's terms, is it illegal to pirate the software by some means and crack it to get the product that was paid for to work? To be clear in this scenario, the item in question is a box with a CD containing the software and inside the same box a key is included to activate said software. This box is purchased from a retail store. The pirated software will only be used by the original owner as a replacement and not distributed or sold. Is it illegal to create an unauthorized copy of the software. Is it illegal to circumvent the software license key checks? Is the receipt enough to prove you own the key and if not why? Is there law to protect the consumer from having to purchase the software twice in this situation?
The DMCA prohibits circumvention of technological measures that effectively control access to a copyrighted work. So you can't legally "crack" the software, period -- even if you own a disc containing the software and have a valid license to use it, a license to use the work is not authorization to circumvent access controls. So if the disc is copy-protected, by my understanding of the DMCA, you're kinda screwed. (The company might be willing to provide you a replacement copy, even if only to maintain the illusion that the software is "licensed, not sold". But you can't make one yourself.) Likewise, if you have a copy of the disc but have lost the license key, you're screwed. Even if you could prove beyond any doubt that you are the licensee, there's not any law i'm aware of that would compel the copyright owner to provide you another license key. And courts have held that distribution of license keys without authorization is a violation of the DMCA. So whoever might provide you another key, if they're not the copyright holder, has broken the law. If you managed to copy the disc from a friend (without circumventing any kind of copy protection), and had your own license key, you might be in a better position. Many EULAs allow you to make a backup copy. Even if they didn't, copyright law does, so there's a possible case for fair use.
I'm not sure this would be a copyright violation. 17 USC 117 says: (a)Making of Additional Copy or Adaptation by Owner of Copy.—Notwithstanding the provisions of section 106, 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... Due to the shutdown of the license server, it is impossible to use the program without an adaptation. It is therefore an "essential step in the utilization of the computer program", and not infringing, in my opinion.
What you're talking about is called black-box reverse engineering. It can be done, and as long as you are meticulous in your record keeping the fact that it has been done should be an appropriate defence against copyright infringement. But that doesn't help against patent claims - while in copyright cases the fact that code has or has not been directly copied is critical, in patent cases it its irrelevant: if you use a patented method, it's a violation. You therefore will need to be careful about any patents that may have been issued to the original author, as well as avoiding copying.
As you have agreed, by contract, not to reverse engineer the product, technically it would be a "breach of contract" to do so, assuming such terms are enforceable where you live (or wherever the EULA selects as the choice of forum).
You have a contract with the 3rd party vendor. The 3rd party vendor has a contract with Amazon. These two contracts are not related in any way.
Software licenses are protected by copyright, meaning that you need the author's permission to copy them. One way to get permission is to buy a license, since many of them are for sale. Sometimes (e.g. CC licenses) a license to copy the license is granted. You can also read and understand what is in a license, and use that knowledge to write your own. This is different from copying the license, since what you are extracting from the existing licenses is the ideas, not the specific expression.
If you're in the U.S., then section 117 of the Copyright Act is likely what you're looking for. The U.S. Copyright Office says: Under section 117, you or someone you authorize may make a copy of an original computer program if: the new copy is being made for archival (i.e., backup) purposes only; you are the legal owner of the copy; and any copy made for archival purposes is either destroyed, or transferred with the original copy, once the original copy is sold, given away, or otherwise transferred. Based on the information you provided, it sounds like you meet all three of these criteria. They also note that your particular software's license agreement might include special conditions that affect your right to make a backup copy. Such a warning would only make sense if it was legally possible for the software distributor to make such a limitation, so I'm afraid the direct answer to your main question is "yes". It's definitely not the norm - at least in my experiences - but it is a possibility so you'll need to consult your program's license agreement. There's also a possibility that the company misunderstood you and was thinking that you were running a backup server (in the sense of a redundant infrastructure) and not making an offline backup of your entire server. It's quite normal to require an additional license for the former case.
It isn't necessarily "illegal" (in the sense you are committing a crime) but you may be in violation of a verbal contract (which would fall under tort law). Let's take this a bit further. Perhaps Joe Schmoe gave you his debit card information so that you could make deposits for him and he said you could take $5 out for yourself for the trouble. This is a contract between you and Joe for a service. You can't extend Joe's offer to Jane Doe by saying "here is some debit card information, take $2.50 out for yourself". You have no right to extend your contract with Joe to somebody else. Now specifically for passwords it basically boils down to the same thing. Unless Joe gives you explicit permission to give that to somebody else, you can't just decide to unilaterally give what Joe gave you to somebody else. This may be different if Joe said "here, I'm buying you a subscription to service XYZ because you are a nice guy", this may be construed as a gift which transfers ownership. At that point you have control over what is or isn't done with the account. As another example let's say Joe let you borrow his car. You can't turn around and say to Jane, "here's a car you can use", Joe did not extend the offer to Jane, nor did Joe give you the right to extend the offer to another person. It's a moot point though, in the original context of this question, Netflix does restrict you from sharing your passwords "outside your household". Almost every paid service has some restriction against sharing with others. In the end Netflix may shut off Joe's account and Joe may sue you for damages, but you aren't going to be thrown in jail for this. This would be a civil case (tort) which you may be liable for monetary damages.