Section 9--333. Priority of Certain Liens Arising by Operation of Law.
    (a) "Possessory  lien."  In  this  section, "possessory lien" means an
  interest, other than a security interest or an agricultural lien:
         (1) which secures payment or performance  of  an  obligation  for
             services  or  materials  furnished with respect to goods by a
             person in the ordinary course of the person's business;
         (2) which is created by statute or rule of law in  favor  of  the
             person; and
         (3) whose effectiveness depends on the person's possession of the
             goods.
    (b) Priority  of  possessory  lien.  A  possessory  lien  on goods has
  priority over a security interest  in  the  goods  unless  the  lien  is
  created by a statute that expressly provides otherwise.