Thanks for your interest in the videos available from O'Reilly. Basically when you purchase a video it is intended for single use only; meaning intended to be used by the purchaser of the video. If you want someone else to view the video you can lend the video to them, and you would want to follow these guidelines that are set up for ebooks:
Lending: If you buy an O'Reilly ebook from oreilly.com, you may lend it to another person, provided that you do not retain any copies of the book after you lend it. This is the same as the situation when you lend a used print copy—when you lend the copy, you deliver it to the buyer and no longer have a copy in your library. If you have bought a hard copy/ebook bundle, you may of course retain the hard copy, if you lend the ebook.
The usage of ebooks can be applied to our videos and more information on this can be found here: http://shop.oreilly.com/category/cust.... Have a great day!