Where to find ownership info...

[4000dvds2many]

Hey guys,

Can someone tell me where it is that people find current information on what studio and/or entity owns the rights to particular titles? Specifically at the moment I am attempting to find this information for two films:

THE NIGHT WALKER (1964): http://www.imdb.com/title/tt0058403/?ref_=fn_al_tt_3
— Directed by William Castle and starring Barbara Stanwyck & Robert Taylor

AND

DON'T GO TO SLEEP (1982; TV): http://www.imdb.com/title/tt0083844/?ref_=fn_al_tt_1
Starring Valerie Harper, Ruth Gordon, Dennis Weaver

Neither of these has ever been released even on DVD and with so many catalog titles making it to Blu-Ray these days there is no excuse for that.
Both movies are fantastic and I'm sick of watching them in crappy quality bootlegs. I wanna ask around and suggest releases for them. Can anyone help?