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<TITLE>Encryption patent issues</TITLE>
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	<PARAM NAME="Keyword" VALUE="Encryption, patent issues">
	<PARAM NAME="Keyword" VALUE="IDEA">
	<PARAM NAME="Keyword" VALUE="RSA">
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<H2><A NAME="encryptpatent"></A>Encryption patent issues</H2>

<P>The IDEA<sup>TM</sup> block cipher is patented by Ascom-Tech AG. The
Swiss patent number is PCT/CH91/00117, the European patent
number is EP 0 482 154 B1, and the U.S. patent number is
US005214703.  IDEA<sup>TM</sup> is a trademark of Ascom-Tech AG.  There
is no license fee required for noncommercial use.  Commercial users
may obtain licensing details from MediaCrypt AG at IDEA@mediacrypt.com.</P>

<P>You can use <A HREF="encryptidea.htm">IDEA encryption</A>
for noncommercial communications without a license;
commercial use is prohibited without a license.  If
you don't want to obtain a license from MediaCrypt, use
<A HREF="encryptaes.htm">AES</A>,
<A HREF="encryptblowfish.htm">Blowfish</A>,
<A HREF="encryptdes.htm">DES</A>,
or <A HREF="encryptotp.htm">key
file</A> encryption instead.</P>

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