Credit Card TOS: "No Occult Material"

Warren Ellis.com has an entry: Square: It's A Kind of Magic, about the Tos involving credit card purchases:

So I looked at this clever new thing called Square, that’ll let you accept and make card payments on your phone. It comes from a good place: the inspiration was an artist who couldn’t sell a piece of art because he couldn’t process card payments on the spot. I like their intent a great deal. And I was picking through the terms of service, to see if this was a US-only thing, because obviously I know a bunch of people who might find Square useful. (A simple mobile card processing solution would be a boon for creators working tables at conventions.) And I found this:

And you'll have to read more on his blog. Thanks to The Daily Grail for the link.