YouTube – How to Share Clips Anonymously

Here's what Youtube says for sharing private videos. So, if you're sending the email notifications the way the steps say, then like one of the other answers says, maybe your friends need to add service@youtube.com to their email address book.

If you'd like to share one of your videos with a select and limited audience, you can do so by setting your video to private. Once the video's set to private you'll be able to share it with fifty other users.

Once you've set the video to private you'll be able to send the video's private URL with your contacts. Once your contacts receive the private URL, they'll be able to sign into their YouTube account and watch the video.

Here's how to find and send a private video's private URL:

1. Sign into your YouTube account and click the Account link located (at the top-right of any page ).
2. Then click the Uploaded Videos link. Click and choose the video you want to send to your friends. Then, click the "Edit" button.
3. Under the "Broadcasting and Sharing Options" section (on the left-hand side of the page towards the bottom) you'll see "Privacy" options. Click the little black arrow / triangle to expand and see all your privacy options (if its not already open and you cannot see your privacy options).
4. If the video's set to private, there will be a URL section below the "Private" option. This is the special private link that you will send to (up to) fifty contacts so that they can watch your private video.
5. Email / send a private message including the private video's special URL. When your friends receive the email invitation, they'll need to: Sign into their YouTube account
6. Click the video URL. They'll then be able to watch the video

That's it! You've now learned how to share a private video with your contacts!

Can't think of a faster way. I would download the videos with Firefox Download Helper extension (you just right-click on status bar and download), and then maybe not use YouTube, but a similar service (as you don't mind about SEO, etc, and is more about just having them available).

I'd use Viddler, as in my tests, it does not re-compress an FLV and should show at the same quality (no loss) that you downloaded from YouTube. Download Helper usually will let you download the several resoloutions flvs available.

However, the involved procedure of re-uploading to YouTube might bring a loss in quality.