What about linking to videos?
What has been uniformly held to be legal is, if the site you’re linking to says it’s OK to link to them, then you can index their site and provide a link that brings up the linked web page as long as it’s not grouped within your framing so that you can’t tell where the source of the video is. Framing it inside your own stuff is impermissible, unless the (originating) site allows it, like YouTube. Indexing and then providing a link to the site as if it were a phonebook has been held permissible in several cases so long as you don’t make the link look like the content is yours.