And while this book may be of British origin, Europe didn't extend the copyrights on American music the last time around. They consider Elvis, Sinatra, and other recordings from 50 years ago public domain.
All of that postdates Orwell's work.
Yup. And if you go to Project Gutenberg Australia, you'll find that 1984 is not under copyright there. Neither is Animal Farm
Many other books and authors that are available because Australia's more reasonable laws, are available HERE
Given its placement on mega-cheap DVD racks, I would guess that the animated version of Animal Farm (very nicely done, btw) is regarded as public domain. I would be surprised if those cut-rate DVD companies are paying royalties to the Orwell estate.