中文摘要：

技术措施能够保护版权,同时也被版权人用来实现垄断、下游控制和价格歧视,客观上影响到用户的选择权、使用权和隐私权。2010年美国国会图书馆首次将手机越狱确定为禁止规避技术措施的例外,并在2015年扩展到移动通信设备越狱。关于该例外的博弈主要围绕美国国会图书馆的权限、是否构成合理使用以及如何界定移动通信设备等问题展开。移动通信设备越狱例外的确立及其规则的细化顺应了社会发展需求,但规则对规避主体和规避对象的界定不太明确,需要细化和明确。

英文摘要：

Technological measures,which protecting copyright and being used by owners of copyrights to achieve monopoly,down-stream control and price discrimination,affect users＇ right of selection,use and privacy. In 2010,Library of Congress（LC）listed mobile phone jail-breaking as one of the exemptions,and extended the exemption to all mobile devices in 2015. The exemption involves the issues concerning the rights of LC,how to judge a fair use,how to define a mobile computing device,etc. The exemption and its rules adapt to social development,but fail to define the circumvention subjects and objects,thus needing further clarification.