It's probably a multi region disc. Most Warner, all C-Interactive and many Magnavision releases are usually multi (if not ALL) region discs. Good to know Viva-Disney is also following suit.
Whoa. It turns out I have some DVDs that are multi-regions. I think most of my Viva DVDs are both for Region 3 and 5. Some are actually Region 1 as well (Hannah Montana the Movie, WALL-E Disc 2, Narnia: Prince Caspian Disc 2, Night at the Museum 2 Disc 2). My C Interactive titles (except for LOTR which I haven't checked) were Region 3 only.
Thanks for the reply & info!