Paid for or subscription viewing video system?

[Steve-F]

I have a client who has a batch of training videos. They’d like a web based solution through which customers would pay to view the videos. Ideally this would be for a limited time and somehow copy protected, I suppose a bit like renting a movie from iTunes where you get xx days to watch and after this date it disappears. A log in system might be a solution, that allows access to a movie and then the log in expires after so many days.
I know how to encode videos… not sure how to make them expire after a period of time???
I’m a novice at web design and not sure about log ins, password systems etc.. and this is where I hope someone here might help.

Any ideas?

Steve