Obfuscate Wordpress Mp3s and folders

I need to have all links to mp3 files on a Wordpress site hidden from the user without being hidden from the mp3 player I have set up on the page to play them. (Initial defense against unauthorized downloads.)

I would also like to remove the \"wp-\" prefix on all wordpress folder names (wp-admin, wp-content, wp-includes) in a way that will not break future updates to Wordpress.

Best if both of these tasks can be done without renaming the actual directory and instead using PHP, .htaccess, Javascript, or something else to \"mask\" the true url.

Thanks!