See RSA Security's press release at

You can configure OpenSSL so as not to use RC5 and IDEA by using

 ./config no-rc5 no-idea

Until the RSA patent expires, U.S. users may want to use

 ./config no-rc5 no-idea no-rsa

Please note that you will *not* be able to communicate with most of

the popular web browsers without RSA support.

* Is OpenSSL thread-safe?

 country.  The file contains some of the patents that we know about or are

 rumoured to exist. This is not a definitive list.

 RSA Data Security holds software patents on the RSA and RC5 algorithms.  If

 their ciphers are used used inside the USA (and Japan?), you must contact RSA

 Data Security for licensing conditions. Their web page is

 http://www.rsa.com/.

 RSA Security holds software patents on the RC5 algorithm.  If you

 intend to use this cipher, you must contact RSA Security for

 licensing conditions. Their web page is http://www.rsasecurity.com/.

 RC4 is a trademark of RSA Data Security, so use of this label should perhaps

 only be used with RSA Data Security's permission. 

 RC4 is a trademark of RSA Security, so use of this label should perhaps

 only be used with RSA Security's permission. 

 The IDEA algorithm is patented by Ascom in Austria, France, Germany, Italy,

 Japan, Netherlands, Spain, Sweden, Switzerland, UK and the USA.  They should

 a Win32 platform, read the INSTALL.W32 file.  For OpenVMS systems, read

 INSTALL.VMS.

 For people in the USA, it is possible to compile OpenSSL to use RSA Inc.'s

 public key library, RSAREF, by configuring OpenSSL with the option "rsaref".

 Read the documentation in the doc/ directory.  It is quite rough, but it

 lists the functions, you will probably have to look at the code to work out

 how to used them. Look at the example programs.