480 authentication required

please can anyone tell me what 480 authentication required means im having difficulty when trying to download and every film has this message. i have never had this message before so dont know what it means or how to get past this to download

plaese can someone enlighten me

Jimmyblackcab

This error message comes from your Usenet provider, not us. Check that the login data in your client is correct, and contact their support if you're still having trouble.