ISS BlackICE PC Protection 3.6 cpj and cpu, and possibly earlier versions, allows local users to bypass the protection scheme by using the ZwDeleteFile API function to delete the critical filelock.txt file, which stores information about protected files.
https://exchange.xforce.ibmcloud.com/vulnerabilities/29575
http://www.securityfocus.com/bid/20546
http://www.securityfocus.com/archive/1/448763/100/0/threaded
http://www.matousec.com/info/advisories/BlackICE-Filelock-protection-bypass.php
http://securityreason.com/securityalert/2361
http://archives.neohapsis.com/archives/fulldisclosure/2006-10/0298.html