Traditional cryptography technology focused on the access control and confidentiality communications of digital products, but for authentication and copyright piracy tracing it is insufficient.
传统的密码学技术侧重于对数字产品的访问控制和保密通信，但是对版权认证和盗版追踪问题显得力不从心。
To control this unauthorized use of technology several laws like patent laws, copyright laws etc were drafted all around the world.
为了控制这种未经授权的使用技术，一些法律，如专利法，版权法等被起草在世界各地。
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