C:\dp>type non.txt
// $Id: non.txt,v 1.1 2005-06-06 22:44:43+09 kaiya Exp $

// とにかく全部不許可
grant {
};

C:\dp>run non.txt DownloadWrite

C:\dp>java -Djava.security.manager -Djava.security.policy==non.txt NetMultiLoader DownloadWrite
Exception in thread "main" java.security.AccessControlException: access denied (java.lang.RuntimePermission createClassLoader)
        at java.security.AccessControlContext.checkPermission(AccessControlContext.java:269)
        at java.security.AccessController.checkPermission(AccessController.java:401)
        at java.lang.SecurityManager.checkPermission(SecurityManager.java:524)
        at java.lang.SecurityManager.checkCreateClassLoader(SecurityManager.java:586)
        at java.lang.ClassLoader.<init>(ClassLoader.java:210)
        at java.security.SecureClassLoader.<init>(SecureClassLoader.java:76)
        at java.net.URLClassLoader.<init>(URLClassLoader.java:112)
        at NetMultiLoader.<init>(NetMultiLoader.java:17)
        at NetMultiLoader.main(NetMultiLoader.java:108)

C:\dp>