clarify trade secret issue

src/lib/libc/crypt/arc4random.3

@@ -1,4 +1,4 @@
-.\" $OpenBSD: arc4random.3,v 1.8 1999/05/25 13:06:44 aaron Exp $
+.\" $OpenBSD: arc4random.3,v 1.9 1999/06/30 01:40:18 deraadt Exp $
 .\" Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
 .\" All rights reserved.
 .\"
@@ -74,10 +74,15 @@ automatically initializes itself.
 .Xr rand48 3 ,
 .Xr random 3
 .Sh HISTORY
+An algorithm call
 .Pa RC4 
-has been designed by RSA Data Security, Inc. It was posted anonymously
-to the USENET and was confirmed to be equivalent by several sources who
-had access to the original cipher. Since 
+was designed by RSA Data Security, Inc.  It was considered a trade secret,
+but not trademarked.
+A clone of this was posted anonymously to the USENET and was confirmed to
+be equivalent by several sources who had access to the original cipher.
+Because of the trade secret situation, RSA Data Security, Inc. can do
+nothing about the situation.
+Since
 .Pa RC4
 used to be a trade secret, the cipher is now referred to as 
 .Pa ARC4 .