
Copyright (C) 1992,1993,1994 Trusted Information Systems, Incorporated

Export of this software from the United States of America and Canada
requires a specific license from the United States Government.  It is
the responsibility of any person or organization contemplating export to
obtain such a license before exporting.

WITHIN THAT CONSTRAINT, the full text of the license agreement that
specifies the conditions under which this software may be used is
published in the file "license.txt" in the same directory as this file.

Trusted Information Systems makes no representation about the
suitability of this software for any purpose.  It is provided
"as is" without express or implied warranty.


WHAT IS IT?

RSA Data Security, Inc., and Trusted Information Systems, Inc., are
pleased to provide TIS/PEM, a reference implementation of Privacy
Enhanced Mail (PEM).  In order to foster acceptance of PEM and provide
the community with a usable, working version of this technology, TIS/PEM
is being made available for broad use on the following basis.

TIS/PEM is distributed in source code form, with all modules written in
the C programming language.  It runs on many UNIX derived platforms,
including BSD, System V, NeXT, and Ultrix.

TIS/PEM is a product of Trusted Information Systems, Inc., and is made
available with the cooperation of RSA Data Security, Inc.

For instructions on how to install TIS/PEM, please see the file INSTALL
in the same directory as this file.


WHAT YOU CAN AND CAN NOT DO WITH TIS/PEM

The license in the file license.txt (in the same directory as this file)
gives legal terms and conditions.  The following is the layman's
interpretation, for information only and with no legal weight.

TIS/PEM is for sending and receiving Privacy Enhanced Mail.  It is not to be
utilized in any form or for any purpose other than to send and receive
Privacy Enhanced Mail.  Other than the restriction that the code is to be
used for Privacy Enhanced Mail, there is no limitation on the purposes for
which it may be employed.  It is specifically intended that TIS/PEM be used
to protect the full range of electronic mail transactions.  In particular,
users are encouraged to use it for research, education, commercial, and
personal transactions.

TIS/PEM includes RSAREF, a cryptography package supplied by RSA Data
Security, Inc. (RSADSI).  This license is granted by TIS with the permission
of RSADSI and applies to the combination of TIS/PEM with RSAREF.  It does
not extend to other uses of RSAREF or to RSAREF by itself.  This scope is
broader than the license which covers RSAREF alone.  For other uses of
RSAREF, contact RSADSI directly.

You can distribute TIS/PEM freely within your organization under the same
terms and conditions as the TIS/PEM license.  You cannot distribute TIS/PEM
outside of your organization.  This restriction is intended to avoid
inclusion of TIS/PEM as part of a commercial offering.  TIS/PEM and its
documentation may not be incorporated into any program, other product, or
any service that is sold, or for which any revenue or other consideration is
received.

TIS/PEM may be used with certificates issued within the Internet certificate
hierarchy or with certificates outside of this hierarchy.  In either case,
users are responsible for the trust invested in any certificate.  The
mechanisms provided in this implementation support the trust model defined
in RFC 1422 and also permit other trust models to be employed.  Similarly,
this code supports the use of distinguished names as described in RFC 1422,
but it also permits the use of distinguished names that are aligned with
electronic mail addresses.

The certificate and key issuing facilities of TIS/PEM may be used to issue
certificates and keys within your own organization.  You cannot issue
certificates or keys to persons or entities outside of your organization.

You can modify TIS/PEM as required to port it to other operating systems and
compilers.  Any such modification is subject to the terms of this license.
TIS requests, but does not require, that you give TIS a copy of the changes.

You can not send TIS/PEM outside the United States or Canada, nor can you
give it to anyone who is not a U.S. or Canadian citizen and does not have a
U.S. "green card."  (These are U.S. State and Commerce Department
requirements because RSA and DES are export-controlled technologies.)

As with any system involving cryptography, there are certain risks which are
inherent.  Users are particularly cautioned that the security of their mail
depends in part on unpredictability of the keys and on the protection of
private keys.  Both of these matters are dependent on the execution
environment, which is outside the control of this code.  TIS assumes no
liability for any flaws in the security of this system.  System
Administrators and Users are referred to the documentation for further
guidance.


CERTIFICATE REGISTRATION

Users or groups who wish to use TIS/PEM with certificates that are part of
the Internet certificate hierarchy should contact the appropriate
certification authority.  Organizations wishing to issue certificates to
their users should contact a Policy Certification Authority (PCA).  Both TIS
and RSADSI operate PCAs.

For information on TIS's PCA, please send email to

	<tispca-info@tis.com>

For information on RSADSI's PCA, please send email to

	<pca-info@rsa.com>


USERS GROUP

A TIS/PEM electronic users group mailing list has been created for
discussions related to the use of Trusted Information Systems' PEM
implementation.  Please send contributions to the list proper to
"tispem-users@tis.com".  Administrivia, e.g., additions to or deletions from
the list, should be sent to "tispem-users-request@tis.com".

TIS/PEM technical questions, license issues, bug reports, etc., should be
addressed "tispem-support@tis.com".


DEVELOPERS GROUP

A PEM Developers mailing list has been created for discussions related to
the development and deployment of Privacy Enhanced Mail systems.  Please
send contributions to the list proper to "pem-dev@tis.com".  Administrivia,
e.g., additions to or deletions from the list, should be sent to
"pem-dev-request@tis.com".

If you have any questions or comments about this release of TIS/PEM, please
send them by email to "tispem-support@tis.com" or mail them to:

			 Privacy Enhanced Mail
		      Trusted Information Systems
			  3060 Washington Road
			   Glenwood, MD 21738

			     (301) 854-6889
			  FAX: (301) 854-5363
