This paper proposes a novel late join approach for Dynamic Locking Mechanism (DLM) in Internet-based real-time collaborative editing systems. The main idea is that: in the process of late join, four cases are classified according to the situations of whether the user has enabled the DLM or not and whether the user is in the session or not. And different transmission steps are adopted for each case in order to achieve the goal that the dynamic locking data can be synchronized. This approach can maintain the consistency of locking data in the distributed collaborative environment more efficiently. And the process of late join for multiple users and the error control method in the network transmission are also presented in this paper.
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