How to do large video files to paying members

[emailapphost]

My forum has free and paid members.

Paying members have access to a few more forums.
I now want to provide premium video content to the paid members.
Preferably as video streamed inside their browser (as opposed to video that they download first).
The video files are 50-300 MB size - rather large and getting larger.

How would you do this?
It seems difficult to upload such large files as attachments in vBulletin.
I could have the files on my server outside vBulletin as plain files (they will then be accessible if people know the url, no so good).
Or I can set up a password protected folder on my server.

Ideas appreciated.