这类网站很受年轻人的欢迎，但却触碰到了版权的问题。
Such websites are very popular among young people but have copyright problems.
主要问题之一就是版权。
然后介绍版权集体管理的概念、原则、内容等基本问题。
Then, the concept, principle and content of collective management are introduced.
这里涉及到版权的问题吗？
摘要：访问控制问题是数字版权管理中的一个重要安全问题。
Absrtact: Access control has become a difficult and important question of the digital rights management.
摘要：访问控制问题是数字版权管理中的一个重要安全问题。
Absrtact: Access control has become a difficult and important question of the digital rights management.
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