Should not be a problem.

by R. Proffitt Moderator - 2/3/13 11:34 AM

In Reply to: Itunes by jenkris123

(copy from your other post.)

" You shall not download any Content unless you see a "download" or similar link displayed by YouTube on the Service for that Content. You shall not copy, reproduce, distribute, transmit, broadcast, display, sell, license, or otherwise exploit any Content for any other purposes without the prior written consent of YouTube or the respective licensors of the Content. YouTube and its licensors reserve all rights not expressly granted in and to the Service and the Content."
http://www.youtube.com/static?template=terms

So when you see the download button, use that then add that to your library.
Bob