engineGrant.setGrantee(SAcl.GRANTEE_USER);
          engineGrant.setCanonicalUserID(((CanonicalUser)grantee).getID());
        } 
        else if (grantee instanceof Group)
        {
           Group temp = (Group)grantee;
           String uri = temp.getURI();
           if ( uri.equalsIgnoreCase( "http://acs.amazonaws.com/groups/global/AllUsers" )) {
              // -> this allows all public unauthenticated access based on permission given
              engineGrant.setGrantee(SAcl.GRANTEE_ALLUSERS);
              engineGrant.setCanonicalUserID( "*" );
           }