Re: MOPAC 7 and MOPAC 93

 James J. P. Stewart wrote:
 >
 > Recently there have been several messages regarding possible
 > errors in MOPAC 7.  These errors were revealed at run-time.
 >
 > I would like to reiterate:  MOPAC 7 is NOT intended for production
 > work.  It should NOT be used by users.  It is intended to be a
 > public-domain source of code for program developers.
 >
 Due to this statement, I've got the question.  What is the copyright
 status of MOPAC7.  Or more preciselly, where can I use its code?
 As it is stated in the beginning of aababc.f:
 C
 C         Notice of Public Domain nature of this Program
 C
 C      'This computer program is a work of the United States
 C       Government and as such is not subject to protection by
 C       copyright (17 U.S.C. # 105.)  Any person who fraudulently
 C       places a copyright notice or does any other act contrary
 C       to the provisions of 17 U.S. Code 506(c) shall be subject
 C       to the penalties provided therein.  This notice shall not
 C       be altered or removed from this software and is to be on
 C       all reproductions.'
 C
 Does this means I can use this code anywhere I want?  Can I sell it or
 the code, derived for it?  Or, possibly, only use it for non-commercial
 purposes?
 Any hint will be helpfull.
 > There are about 300 to 400 known errors in MOPAC 7.  The errors that
 > users have reported are known bugs.
 >
 Are they listed somewhere for public access?
 > Many users have asked for bug-fixes for MOPAC 7.  These requests will not
 > be honored.  MOPAC 7 is not supported code.  If users elect to use
 > a program that is known to be buggy, and which is not supported, then
 > user beware - a lot of time has been unecessarily wasted by using MOPAC 7.
 >
 Please, respond directly to me (akhavr(-(at)-)compchem.kiev.ua).
 If there will be requests, I will post the summary.
 Thanks.
 SY
 --
 Andrey V Khavryutchenko
 akhavr(-(at)-)compchem.kiev.ua
 Interests: Computational Chemistry, OOA&OOP, The Net