padded cell

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 naivete (see
   {naive}).  Also `padded cell environment'.