Always read the EULA even if you think that you know what it should say - some unscrupulous souls may insert a gotcha that ruins your life if they follow through
Of note is the M$ EULA term which prohibited reverse engineering; this is the practice of black box engineering the functionality of a piece of software without seeing the original code-base. It is what M$ did with the MAC OS to create Windows. M$ had a single copy of the OS and Apples original source for the applications Write, Paint, Calc, Draw, given to them to create a viable enhanced suite of software for the Mac which we now know as Word, Excel, etc (Office).
M$ had two independent teams that never crossed paths working on both of these products (Office and Windows) as well as a member of the Mac team reporting on their observations of what the system did in response to any user action - end result reverse engineered Windows is actually a different take on the Mac OS ideas of WIMP - Windows-Icons-Menus-Pointers (mouse or other interactive device) originally developed by Xerox at Palo Alto research Center and which Apple bought lock, stock and barrel and integrated into the Lisa and then the Macintosh.....