Airport Extreme HDD Sharing iTunes protected videos

Hi all,

I've setup my Airport express to share my LaCiE Porshe Design External HDD (Awesome product) over my network. Everything works fine, except for iTunes protected videos on iPad. They work on my iMac and other computers (so long as i am signed into my Apple ID) but not on iPad.

I use filebrowser to connect to the Airport through it's IP.

Thanks,

Jack