Restricting unregistered from seeing pics??

[dmeister]

I'm sure these have been asked a hundred times, I did a search and did not find simple answers for me----a simple person -- "Newbie"

1) How do I prevent unregistered users from viewing Pictures / attachments. I didn't see anything for unregisterd users under the attachment permissions?
I want to use this as a hook to get people to register.

2) How do I get my users to load pictures only using places like photo bucket + others.

3) How do I do the same thing for videos from places like youtube?

Thanks
The Newbie
dmeister