✔ 最佳答案
login your account
set that video to private
http://www.google.com/support/youtube/bin/answer.py?answer=57741&topic=10519
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Help Resources Home > Help Center Home > Getting Started > Saving, Collecting, and Sharing Videos
How do I share videos?
Sharing a video is simple—just log in, click on the "Share" button at the bottom of the video player, and enter the email addresses or YouTube usernames of the people to whom you want to send it. Click the "Send" button, and you're all done!