Notice of Public Domain nature of MOPAC

'This computer program is a work of the United States
 Government and as such is not subject to protection by
 copyright (17 U.S.C. # 105.)  Any person who fraudulently
 places a copyright notice or does any other act contrary
 to the provisions of 17 U.S. Code 506(c) shall be subject
 to the penalties provided therein.  This notice shall not
 be altered or removed from this software and is to be on
 all reproductions.'