This model is better in security and flexibility than traditional security toolkits.

该模型在安全性、灵活性上有较大的提高。

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According to the shortcomings of the traditional PDM security management, this paper establishes a workspace-based authorization management model and a DPDM network security model.

本文针对传统PD M安全管理的缺点，建立了基于工作空间的权限管理模型和网络安全模型。

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Traditional access control models, including MAC model and DAC model, have no longer been able to meet the security need of contemporary systems.

传统的访问控制模型——MAC模型和DAC模型，已远不能满足当代系统安全的需要。

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