Per the First Sale Doctrine, can I stream a DVD? If I buy a DVD or Blu-ray, rent it to someone, and stream it to them for their personal/private use, is that permissible via the First Sale Doctrine? Note that I'm not ripping the DVD or Blu-ray, but inserting the physical copy into the computer drive and streaming it to someone else.
First sale doctrine is about selling something that you bought. You buy X, you pay your money, you have it and you own it. You don't want it anymore, so you sell it to me for money. Now you don't have X anymore, but I have it. That's what First Sale Doctrine is about: That you can buy something, and then you sell everything you have, including all the copies, to someone else. What you are suggesting is absolutely nothing like that. You buy a DVD, you stream it, and after that you still have the DVD. That is absolutely not covered. What would be covered is that you sell the DVD to me, you hand over the DVD for cash, and you hand all the copies that you made over to me as well and destroy any traces that you still have. After the sale, you have my money and nothing else.
A matter of terminology, what you want is not the copyright, but a license to use the copyright, presumably a non-exclusive license. You would probably need to approach a licensing department at Disney. They will ask lots of questions, and if they are open to the possibility, will quote a fee, which will, i would think, be sizable. Anyone should be able to ask, but I suspect that most requests are refused. It would probably be well to have a business plan laid out, and exactly how the images would be used in your plan. Disney can refuse any license, or offer one on whatever terms it pleases.
You are free to sell or not to sell to whoever you like (unless it is illegal discrimination, like not selling to white Christians), but it doesn't make a difference, because anyone who buys the software from you can legally sell it on to anyone they want. So you cannot control who ends up owning the software. If I want the software and you don't sell it to me, and I still want it, I'll just ask a friend to buy it and give them the money. Other people would just get a pirated copy if you refuse to sell to them (and would have very little bad conscience since they offered you cash and you refused to take it). You can put terms into a license, and in the USA this is binding. The customer may not agree with the license, and in that case they have the right to get a refund for the software. In the EU, I don't think a license is binding, so you'd have to sign a legally binding contract with the buyer. Apart from all that, you have very little chance to find out if the software is used against your wishes and to do anything about it.
You also retain the right to license the work to others. Therefore you can sell similar rights to MusicBook and anyone else, as long as you do not grant an exclusive license (you have already licensed another party to distribute). They do not gain the right to sub-license your work. If you had executed a copyright transfer, you would have no rights to the work whatsoever (leaving out moral rights for jurisdictions that have them and where they are absolute).
There is no such law; copyright secures exclusive rights for the copyright holder (and related rights sometimes secure certain rights for the author which cannot be sold or given away except through death), but it cannot be used to force them to spend money to distribute it in a form that you can conveniently use. Such a rule would defeat the purpose of copyright law, which is to give the copyright holder control over the use of the work, not take away their ability to do so. You can certainly request that they release the work, and can offer to pay them for doing so. But someone who does not own the copyright or any related rights cannot use copyright law to force the person who does own the copyright to spend their own money to convert a show into a new format.
The section you quote as clearly saying a thing is not clearly saying the thing. However: you cannot pass on or resell any license keys seems to say a thing clearly. However, one could argue that it's the sharer of the account who is in the wrong, and not the person receiving and passing on the account. I'd say that that piece of the agreement, combined with this: must not... let other people get access to anything we've made in a way that is unfair or unreasonable says that, yes, they are out of bounds.
You can licence your copyright under as many licences as you like to as many people as you like It's your copyright - you can do what you want with it. What you can't do is give someone an exclusive licence and then give licences to others - that would be a breach of contract with the exclusive licensee. How you let people know about the available licences is also up to you - your bio on Stack Exchange is fine.
This is relatively uncharted legal territory, so until multiple cases establish some sort of precedent, we can only guess. I know of no legal requirement that a Browser or User has to submit cookies or referrer data or other meta-information accurately. In that regard, a user is unlikely to be prosecuted just for submitting HTTP headers. It is likely closely related to Free Speech issues. The DMCA spells out that it is illegal to circumvent copyright protection measures. While this law is typically used to make it illegal to copy DVDs, video-games or streaming movies, it is possible that the "3-free articles" policy could be interpreted as a copyright protection mechanism, and defeating it by changing HTTP headers is a circumvention. A good summary is here. A specific site's TOS (Terms of Service) probably contains language that spells out it is a violation to use the site in a manner other than as it is intended. This is a typical anti-hacking, anti-screen-scraping provision. Altering a browser session to circumvent their services is probably a violation of the license to access the site, and may open a user to a civil lawsuit for damages or even criminal hacking charges (the details of which are different state-to-state)