• 1. Rights Expression Language: 描述语言 | 表达语言 | 权利表示语言
• 2. Digital Rights Expression Language: 描述语言
• 3. drm rights expression language: 版权描述语言

• 1.Firstlty, the paper brings out license model of usage of learning resources by integrating learning object metadata specifiction with rights expression language.
  本文首先通过权利信息描述和资源的元数据描述的整合提出了教育资源的数字权利许可证基本模型。
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• 2.Giving the standard specifications of digital works' rights and information is crucial to solve it which is the problem of solving the interoperability of digital rights expression language.
  互操作性是数字版权保护系统中核心问题，解决互操作性最关键的是对数字作品的信息和权利做出统一的规范，也就是解决数字权利描述语言的互操作性问题。
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