Overiding one permission

Hi,

I want to allow the user to have all permission except deleting a file.
How do I do this? Do I need to list out all the permission? I tried the
policy below, but I'm still able to delete file.txt.

grant {
    permission java.security.AllPermission;
    permission java.io.FilePermission "file.txt", "read";
}

Thanks much,
-Rach

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