I can think of at least some examples from a long time ago where you couldn’t bring in your gear to a customer datacenter as an escorted visitor. They had a room you could use your stuff in on another floor, and would lend your escort a device if needed. It used to be a real pain for our CEs at the time. They’d have to do things like print log files and fax from a nearby kinkos.
It had more to do with contracts in place with mainframe vendors over “trade secrets”.
