It's difficult to find a software which is actually "legal". It depends on where you live.
Just try Moviebox.
http://audials.com/en/how_to_record_...rom/start.html
With this software you're not actually downloading series or movies, you're literally tape-recording everything. This is the fact which makes it legal at some point. Also it's really easy to use. Just watch your movie and record it with one click at the same time