k so first of all i still dont understand this 'Gnutella' network

second of all its stopping me from downloading songs and such...

every time i try to download a song..that i know is not copyrighted i get this messagae that i sstopping me from downloading it.

" Limewire is unable to find a license for this file. Download anyway?
Please note: Limewire cannot monitor or control the content of the Gnutella network. Please respect your local copyright laws"
YES NO CANCEL

so i dont know what to do. i always click cancel because i not sure what to click. can you hel me?