identifier_authority = new byte[6];
        System.arraycopy(src, si, identifier_authority, 0, 6);
        si += 6;
        if (sub_authority_count > 100)
            throw new RuntimeException( "Invalid SID sub_authority_count" );
        sub_authority = new int[sub_authority_count];
        for (int i = 0; i < sub_authority_count; i++) {
            sub_authority[i] = ServerMessageBlock.readInt4( src, si );