Many of the issues of civil rights are very complex and most difficult.
很多公民权利的问题是非常复杂的，而且是很困难的。
Floating population is a special vulnerable group whose legal rights are difficult to guarantee.
流动人口是易于受伤害，合法权益难以保障的特殊人口群体。
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.
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。
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