In Sun Solaris 9 das es ja wieder frei gibt:

cat /usr/bin/clear

#!/usr/bin/sh
# Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T
# All Rights Reserved
# THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T
# The copyright notice above does not evidence any
# actual or intended publication of such source code.
#ident "@(#)clear.sh 1.8 96/10/14 SMI" /* SVr4.0 1.3 */
# Copyright (c) 1987, 1988 Microsoft Corporation
# All Rights Reserved
# This Module contains Proprietary Information of Microsoft
# Corporation and should be treated as Confidential.
# clear the screen with terminfo.
# if an argument is given, print the clear string for that tty type

/usr/bin/tput ${1:+-T$1} clear 2> /dev/null
exit

This Module contains Proprietary Information of Microsoft Corporation. Aber klar doch!