It can add watermark in log record , and protect log record ' s originality and unchangeableness . it provides a powerful and undeniable proof for log audit
2.
Log system based on watermark technology it can add watermark in log record , and protect log record ' s originality and unchangeableness . it provides a powerful and undeniable proof for log audit ; 5
3.
As there are three main defects in the applications of bar codes commonly used in packaging , which are the lack of generative algorithm of 2d pdf417 bar code , the irreversibility of the built bar code , and the unchangeableness of the color of bar code , this paper aims to design a new class of bar code based on coding principles of various bar codes and make it as an integrated software by using the methods of software programming ; and it also aims to remedy the three defects as mentioned above
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