The IDEA(tm) block cipher is covered by patents held by ETH and a
Swiss company called 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(tm) is a trademark of
Ascom-Tech AG. There is no license fee required for noncommercial
use.