I don't think any permission is needed. People on this forum collected the tape covers and we are happy if someone spreads them! There are no many sites to download EP stuff, so just use them, put them on your page! Let just the world know about the Enterprise!
And yes, it's the only webpage where Enterprise tape covers can be downloaded, I think. Enterprise computer was sold mostly in Hungary and no other people dealed with it, there isn't any English webpage of the Enterprise computer, yet, just Hungarian. So we are grateful if you spread EP stuff on the net!