Mackie, the fact that you're getting permissions & making an effort to sort out the okay stuff from the no-nos is a very good thing and I applaud your efforts to do it right. Perhaps, as part of your site's terms of use or FAQ, you could post a list of all your permissions so that the question doesn't come up again. Most, if not all, copyright-safe tube groups & sites do that. That way you don't get hassled & people wanting your tubes don't get confused about whether or not it's okay to use them.