In view of this situation, the thesis design and implement a Software Copyright Protection system base on PKI.

鉴于这种情况，本文设计并实现了一个基于PKI的软件版权保护系统。

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The great accomplishment achieved by the us copyright industry is closely related to its continually improving copyright protection system.

美国版权产业所取得的巨大成就与其不断完善的版权保护制度密不可分。

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With digital technology and internet, it becomes quite easy to modify, duplicate and distribute digital works, which has great impact on the existing copyright protection system.

在数字技术和网络环境下，非法编纂、复制和传布数字作品变得相称等闲，这给现有的版权维护机制带来了前所未有的冲击。

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YouTube has a Content ID copyright protection system in place.

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What this deletion would do is to change the copyright protection system for industrial designs which are mass produced, from 25 years after registration to 70 years after the death of the designer.

BBC: Week ahead