 Signed by Woodside two weeks after the February 1, 2005 legislation authorizing the four amendments, they provided for a lower state quota in the "profit-oil", and reduced taxes by 15 percent in certain zones.They also eased environmental constraints, and extended the length and scope of the exploitation and exploration monopoly, among other measures.The disputed amendments were signed by former oil minister Zeidane Ould Hmeida in February 2004 and March 2005.