Cam inspects one to see if he can get into it and, if he can, to check to see if the data's been broken into.
He backs out of the encryption and sews it all back up like it was and then he makes twenty blank ones.
Cam makes a data stick with some nice impersonal English-language corpus on it. Books and audio renderings thereof, principally. He dumps the contents of the stick into each of the twenty computers.
"There."
"Well, I'm a demon and somehow your robot thing summoned me and now I'm kind of annoyed because you've been keeping me in a box and stealing my stuff, but you seem to be friendlier today."
"Demons are a kind of daeva. We look about like humans but with wings, usually, and I have a tail too, some demons have those, some add other things. We make stuff."
"I don't know why that circle worked. And it didn't make me, it brought me here from where I live. It doesn't look like summoning circles usually look. If it worked once, it might work if you drew it again, but I don't think you should do it a second time. I'm very nice, but if I wasn't very nice, when you brought me here and were very rude I could have made a black hole. You shouldn't be rude to loose daeva."