What is the general process for getting a movie remastered?
I assume that first one has to find out what studio or production company has the original master prints and audio tracks. Hopefully the same company owns the rights to the movie. Then I presume you have to cut a deal with the company to make a new master, they loan you the prints and tapes and you go from there.
I notice that some movies have dozens of different deals like this. For example, Blade Runner (1982) has been distributed by more than 20 different companies. As one example, in 1989 the Criteria Collection published a LaserDisc version of Blade Runner, so they would have had to go through the process of negotiating the rights, getting the masters, and then remastering it for their medium (LaserDisc).
I understand the basic steps, but what are the details, how does this process work in detail? How do you even find out who has the masters and the rights, for example?