USAGE
  To use this package add the following lines to ~/.gnupg/options

  load-extension rsa
  load-extension idea     

  You may also add them to /usr/share/gnupg/options.skel to enable them
  automatically for new users.

  With these modules gnupg can decrypt messages encrypted with any version
  of PGP.  Messages encrypted by gnupg to an RSA key can be decrypted by
  pgp 5.x but not by pgp 2.x.

CREDITS
  The IDEA code herein has been taken from:
  Bruce Schneier: Applied Cryptography. John Wiley & Sons, 1996.
  ISBN 0-471-11709-9. .

LICENSE
  Copyright (c) 1997,1998,1999 by Werner Koch (dd9jn)

  Permission is hereby granted, free of charge, to any person obtaining a
  copy of this software and associated documentation files (the "Software"),
  to deal in the Software without restriction, including without limitation
  the rights to use, copy, modify, merge, publish, distribute, sublicense,
  and/or sell copies of the Software, and to permit persons to whom the
  Software is furnished to do so, subject to the following conditions:
 
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
 
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  WERNER KOCH BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
  Except as contained in this notice, the name of Werner Koch shall not be
  used in advertising or otherwise to promote the sale, use or other dealings
  in this Software without prior written authorization from Werner Koch.
 
LEGAL
  ATTENTION: This code should not be exported to the United States
  nor should it be used there without a license agreement with PKP.
  The RSA algorithm is protected by U.S. Patent #4,405,829 which
  expires on September 20, 2000!

  The IDEA algorithm is patented by Ascom Systec Ltd. of CH-5506 Maegenwil,
  Switzerland, who allow it to be used on a royalty-free basis for certain
  non-profit applications.  Commercial users must obtain a license from the
  company in order to use IDEA.	IDEA may be used on a royalty-free basis under
  the following conditions:

  Free use for private purposes:

  The free use of software containing the algorithm is strictly limited to non
  revenue generating data transfer between private individuals, ie not serving
  commercial purposes.  Requests by freeware developers to obtain a
  royalty-free license to spread an application program containing the
  algorithm for non-commercial purposes must be directed to Ascom.

  Special offer for shareware developers:

  There is a special waiver for shareware developers.  Such waiver eliminates
  the upfront fees as well as royalties for the first US$10,000 gross sales of
  a product containing the algorithm if and only if:

  1. The product is being sold for a minimum of US$10 and a maximum of US$50.
  2. The source code for the shareware is available to the public.
 
  Special conditions for research projects:

  The use of the algorithm in research projects is free provided that it serves
  the purpose of such project and within the project duration.  Any use of the
  algorithm after the termination of a project including activities resulting
  from a project and for purposes not directly related to the project requires
  a license.

  Ascom Tech requires the following notice to be included for freeware
  products:

  This software product contains the IDEA algorithm as described and claimed in
  US patent 5,214,703, EPO patent 0482154 (covering Austria, France, Germany,
  Italy, the Netherlands, Spain, Sweden, Switzerland, and the UK), and Japanese
  patent application 508119/1991, "Device for the conversion of a digital block
  and use of same" (hereinafter referred to as "the algorithm").  Any use of
  the algorithm for commercial purposes is thus subject to a license from Ascom
  Systec Ltd. of CH-5506 Maegenwil (Switzerland), being the patentee and sole
  owner of all rights, including the trademark IDEA.

  Commercial purposes shall mean any revenue generating purpose including but
  not limited to:

  i) Using the algorithm for company internal purposes (subject to a site
    license).

  ii) Incorporating the algorithm into any software and distributing such
     software and/or providing services relating thereto to others (subject to
     a product license).

  iii) Using a product containing the algorithm not covered by an IDEA license
      (subject to an end user license).

  All such end user license agreements are available exclusively from Ascom
  Systec Ltd and may be requested via the WWW at http://www.ascom.ch/systec or
  by email to idea@ascom.ch.

  Use other than for commercial purposes is strictly limited to non-revenue
  generating data transfer between private individuals.	The use by government
  agencies, non-profit organizations, etc is considered as use for commercial
  purposes but may be subject to special conditions.  Any misuse will be
  prosecuted.

