Because you do not own the copyright on any of those Beatles videos and materials you do not have the legal right to release any of it under any Creative Commons license  The only thing you can legally license CCpublic domain from your website is any content you create yourself  This is why OTRS is refusing your argument that website appears to be a collector of someone elses copyrighted works We cant use its material unless we have permission from that copyright owner and Apple Corps is not likely to grant that