Ribbons License Agreement			page 1 of 3



	The "ribbons" software distribution package (the software) 
	for general molecular illustration and for error analysis
	in protein crystallography is copyrighted 1987-1997 by 
	Mike Carson (the author) and licensed through the University 
	of Alabama at Birmingham (UAB) Center for Macromolecular
	Crystallography (CMC).

        The CMC's NASA grant encourages the commercialization of our work.
        Thus we are selling the program.

	The copyrighted software is furnished under a license and 
	may be used or copied only in accordance with the terms 
	and fee schedule below:


     1. All rights reserved.  No part of this work may be reproduced 
	in any form or by any means or used to make a derivative work
	(translation, transformation, or adaption) without the written
	permission of the author.  Copies may be made only for backup purposes.

     2. This is a single-site license.  Those wishing to obtain a 
	multi-site license should contact the author for terms.
	The program is to be used solely at the licensee's premises.  
	For an academic license, the program will only be used for 
	academic teaching and research.   Anyone adhering to the terms 
	of this license may use the software.

     3. The software distribution will not be passed on to any third parties. 
	Reasonable precautions will be made to prevent unauthorized access.
	If someone wishes to obtain a copy of the distribution, please
	have them contact the author.

     4. Neither the author or distributor are responsible for the use of
	the code.  No warranty is expressed or implied.
	All information is subject to change without notice and should
	not be construed as a commitment by the author or UAB/CMC for
	further development and support.

     5. Any enhancements made by the licensee will be made available 
	to the author.  If incorporated into future versions, your work 
	will be acknowledged in the manual.  Any bugs will be reported.

     6. The program will be cited if used in a publication.
	M.Carson (1991) Ribbons 2.0, J.Appl.Cryst. 24:958-961  or
	M.Carson (1987) Ribbon Models of Macromolecules, J.Mol.Graphics, 
	5:103-106.

     7. The required fees (if any) will be paid to the UAB/CMC
	within 60 days.   If you choose not to pay after receiving and
	evaluating the software, you promise not to use the software
	and to destroy all copies.






	Ribbons License Agreement			page 2 of 3



	Ribbons Fee Schedule:

	( Yes / No )	I am a member of the ACA.
			All members of the American Crystallographic
			Association receive a $100.00 discount.

	  $100.00	Academic users.  Executable version only.
			As is, no questions asked.

	  $300.00	Academic users.  Above, plus source code
			and E-mail support.

	$1,500.00	Industrial users.  Includes source code
			and E-mail support.


	( Yes / No )	I already have a ribbons license from the UAB/CMC.

	    $0.00	Academic users, update fee.

	  $250.00	Industrial users, update fee.
			(Waived if a license or update has been purchased
			within the last year.)


	( Yes / No )	I can get the distribution over the Internet.

	   $50.00	If no, please explain precisely the medium you
			need.  Pre-payment is required for this option.

			______________________________________________

			______________________________________________



	Please make checks in U.S. $$ payable to the UAB/CMC.
	Please address correspondence to the author.
	For administrative and bureaucratic information, please
	contact Ms. Maxine Rice.

	Postal Address:
			UAB/CMC
			University Station, Box 79 THT
			Birmingham, AL  35294
	E-mail address:
			carson@cmc.uab.edu		(author)
			rice@hera.cmc.uab.edu		(maxine)
	Phone / FAX:
			205-934-1983 / 205-934-0480	(author)
			205-934-7277 / 205-934-0480	(maxine)







	Ribbons License Agreement			page 3 of 3



	I agree to the Ribbons License Agreement.

	date:
			  _______________________________________________

	signature:
			  _______________________________________________

	printed name:
			  _______________________________________________

	amount owed:
			  _______________________________________________


	Additional information for our records
	and for updating the program (please print):

	program administrator
	(if not person above):
			______________________________________________

	E-mail Address:  
			______________________________________________

	Phone/FAX:   
			______________________________________________

	Institution/Dept:    
			______________________________________________


	Mailing Address:
			______________________________________________

			______________________________________________

			______________________________________________

			______________________________________________

			______________________________________________



	Mike Carson
	University of Alabama at Birmingham 
	Center for Macromolecular Crystallography
	July 10, 1994