Hello, this is because the copyright originally purchased by Tudou has expired or it did not have the copyright originally.

Video websites such as Tudou.com need to buy copyright from the copyright owner of movies or TV series before they can play on the website, otherwise it will involve infringement. The purchase of copyright can be divided into permanent purchase and temporary purchase. According to the specific copyright agreement, when the copyright expires at a certain time, the website needs to remove the relevant videos.

If you can give detailed information, you can give a more detailed answer.