Use an htaccess file like this
RewriteEngine on
RewriteCond %{HTTP_REFERER} !^
http://([a-z0-9-]+\.)*yourdomain.com(:80)*/ [NC]
RewriteCond %{HTTP_REFERER} !^
http://([a-z0-9-]+\.)*allowedreferer.com(:80)*/ [NC]
RewriteCond %{HTTP_REFERER} !^
http://([a-z0-9-]+\.)*anotherallowedreferer.com(:80)*/ [NC]
RewriteCond %{HTTP_COOKIE} !(^|(.+
*)id=valid(;.*|$)
RewriteRule /*
http://www.sendhotlinkershere.com[R,L] )
change the URLs obviously...
then, on the content page serving the videos, add this javascript between the HEAD tags.
<SCRIPT LANGUAGE="javascript">
// Calculate the expiration date
var expires = new Date ();
expires.setTime(expires.getTime() + 24 * 60 * 60 * 1000);
document.cookie = "id=valid; path=/" + "; expires=" + expires.toGMTString();
</SCRIPT>
....
that javascript will create a cookie (which is one of the access conditions in that htaccess). So the videos will work after the user views the content page, and be hotlink protected.