It is interesting to note that the LICENSE says:

...

This license permits you to: b. create and sign certificates for people and entities within your own organization; _Mark_

Message-Id: <9306022052.AA09067@TIS.COM> Reply-To: James M Galvin <galvin@TIS.COM> To: TISPEM.Announcement:;@TIS.COM, ietf@cnri.reston.va.us, pem-dev@TIS.COM, rsaref-users@rsa.com, saag-interest@TIS.COM, psrg-interest@isi.edu Subject: Privacy Enhanced Mail available via anonymous FTP Date: Wed, 02 Jun 93 16:51:17 -0400 From: James M Galvin <galvin@TIS.COM> Sender: pem-dev-relay@TIS.COM -----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 4,MIC-CLEAR Content-Domain: RFC822 Originator-ID-Asymmetric: MFMxCzAJBgNVBAYTAlVTMQswCQYDVQQIEwJNRDE kMCIGA1UEChMbVHJ1c3RlZCBJbmZvcm1hdGlvbiBTeXN0ZW1zMREwDwYDVQQLEwh HbGVud29vZA==,02 MIC-Info: RSA-MD5,RSA,ndrjfb54QirydT4/KLgg9HJh+5k0ON+bj9Wil5LeVTE 3E0ST0Bmv12KbChUn5MhxpH556ur0TbWTjl8/csLK52ARxGs0VJlzKfNOWL00SbB JfuyLIM6RLF9uE2ZBNNjP Trusted Information Systems, in cooperation with RSADSI, is pleased to announce the availability of Version 6.0 of TIS/PEM, the Internet reference implementation of Privacy Enhanced Mail. This software is available to US and Canadian organizations and citizens via anonymous ftp. All source code is included, including Version 6.7 of the Rand MH message handling system and Version 1.02 of RSAREF. To retrieve TIS/PEM please FTP to host: ftp.tis.com login: anonymous and retrieve the files pub/PEM/README pub/PEM/LICENSE The README file contains further instructions. The LICENSE file contains the restrictions and rules governing use of TIS/PEM. Please read this file before retrieving the code. Send questions to tispem-support@tis.com -----END PRIVACY-ENHANCED MESSAGE-----