An interesting sidenote on the history of copyright:

If you're in the US and most other countries, by clicking the above link you may commit copyright infringement.

In Australia, the copyright for work of authors who died before 1955 expires 50 years after the death of the author, so Orwell's copyright expired in 2000. That's why OP's link is hosted in Adelaide. The same site has a warning for US users: http://ebooks.adelaide.edu.au/o/orwell/george/

In the US it's 70 years, so Orwell's work is still protected until 2020.