I did a little more research and this might help people who are deciding what movie channels to get (i got it from wiki)-
Max (through HBO) currently has exclusive deals with sister company Warner Bros., DreamWorks (which has been bought by Paramount) and 20th Century Fox. In addition, it holds partial pay-cable rights to movies produced by Sony Pictures Entertainment (excluding those in partnership with Revolution Studios), and Universal Studios (along with Rogue Pictures and Focus Features).
HBO currently has exclusive deals with DreamWorks (which recently was acquired by Paramount/Viacom), Twentieth Century Fox, Universal Studios (along with Rogue Pictures and Focus Features), New Line Cinema, and network sister company Warner Bros. (although recently they passed on a package of recent WB films such as The Polar Express and March of the Penguins due to cost, and therefore have bypassed pay-cable altogether and went straight from pay-per-view to broadcast television).
Showtime has also agreements with MGM Studios, Lions Gate Films, IFC Films (which it shares broadcasting rights with Starz), ThinkFilm, certain films put out by The Weinstein Company (those that are distributed theatrically in conjunction with MGM Studios), and the newly re-formed United Artists (still a subsidiary of MGM). In 2008, the channel signed a deal with First Look Pictures to air their films.
Starz and its fellow movie channels have exclusive film output deals with the Walt Disney Motion Pictures Group (including Walt Disney Pictures, Touchstone Pictures, Hollywood Pictures, Pixar, and Miramax Films), Sony Pictures Entertainment (including Columbia Pictures [alongside films produced by Revolution Studios], Sony Pictures Classics, Screen Gems, TriStar), Overture Films (now Starz's in-house production and distribution company), and Warren Miller Films, among other leading distributors.