Pignus

Pignus, or Pledge, is a loan for security in Roman law of contract. It is commonly used as extra security when a debt exists.

Rights of the Pledgor

 * Pay for the expenses in keeping the thing

Rights of the Plegee

 * Sell the item if debt is not repaid / the main contract fails.
 * Give back the thing if the debt is paid.
 * Not use the thing.
 * Take "Quite Good" care of that thing (a fairly high standard, that of a responsible person).