I'm not sure but there are updates written to
http://www.youtube.com/t/terms

page, especially to the section 4. General Use of the Website – Permissions and Restrictions

Sounds a trouble to flixya.com?

Interesting to notice:
http://web.archive.org/web/*/http://www.youtube.com/t/terms

"We're sorry, access to http://www.youtube.com/t/terms has been blocked by the site owner via robots.txt. "

http://www.youtube.com/robots.txt