Why do you say you have to accept it?
http://www.digital-law-online.info/lpdi1.0/treatise20.html
It is now well-accepted that copyright protects computer programs and other digital information, whether they are in readable source code form or are an executable program that is intended to be understood only by a computer. Copies are made whenever the program is transferred from floppy disk to hard disk or is read into the computer’s memory for execution, and those copies will infringe the copyright of the computer program if they are not permitted by the copyright owner or by copyright law.
2. 'if they are permitted by copyright law' Fair Use is part of copyright law, has that specific defense been challenged when it comes to software execution and caches in RAM?
That said, I can't read a book without reflections in my eyes...
In practice I would trust fair use and try to use such as a defense if sued.
Hard to do when you were shipped a DVD.
That's how the rules have been made, and not complying could be assimilated to piracy.