:padded cell: n. Where you put {luser}s so they can't hurt
anything. A program that limits a luser to a carefully restricted
subset of the capabilities of the host system (for example, the
`rsh(1)' utility on USG UNIX). Note that this is different
from an {iron box} because it is overt and not aimed at
enforcing security so much as protecting others (and the luser)
from the consequences of the luser's boundless naivet'e (see
{naive}). Also `padded cell environment'.
-- The AI Hackers Dictionary