Nah. I certainly don't.
I'd be surprised if there is a rule prohibiting officials from one club trying to find out information about another though. Where do you draw the line? What sort of information is unacceptable? What if an opponent just sends you the information unsolicited, have you...
But even if there is: surely it's more of a disciplinary issue for a Cardiff member of staff than any kind of serious rule breach by Palace?
Palace can only ask: what Cardiff staff choose to tell them is down to themselves alone (and like I said, seems like more of an employment/ contractual...