Applying the modern cryptographical technology constructs two digital copyright protection schemes.
利用现代密码技术构造了两个数字版权保护方案。
VPN cryptographical system is concerned with cryptographical technology, authentication technology and VPN implementation protocols.
VPN密码系统的构建涉及几个方面的技术，包括加密技术、认证技术、实现协议等。
The problem of digital copyright protection is taken into account by more and more people. Cryptographical technology is one of the key solutions to this problem.
数字版权保护问题越来越受到人们的重视，密码技术是解决这一问题的关键技术之一。
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