I found it is interesting that the article “Terms and Conditions". The author said"To avoid any unintentional copyright infringements it is best to use my own work where possible or to make use of Creative Commons."

However it is hard to define and it is not as easy as it to be carried out.

It is really hard to control, for instance , a huge country like china, a big number of population.

The internet create a lot advantages for people however it also lead to many problems, how to establish a healthy  and harmonious network system need every individual work on it .