This excerpt taken from the PBR 6-K filed Mar 18, 2005.
(a) Deregulation of the Brazilian fuel market
In accordance with the Petroleum Law and subsequent legislation, the fuel market in Brazil was fully deregulated as from January 1, 2002. Therefore, as of this date the Petroleum and Alcohol Account has no longer been used to reimburse expenses in connection with the Federal Governments stabilization policy on the price of oil products and fuel alcohol to PETROBRAS and third parties. This account will only include changes in amounts with triggering events having occurred before December 31, 2001, in accordance with Law No. 10.453, of May 13, 2002.