To improve the safety and security of children in the ubiquitous society, effective measures should be taken against various "risks" prevalent in such situations. In this context, the "Act on Secure and Safe Internet Use Environment for Young Users," which took effect in April 2009, plays an important role in providing a secure environment to young Internet users-especially, mobile Internet users. It compels the national and local governments, mobile careers, and parents to provide children with secure Internet environments-for example, by introducing filtering. This study surveys parents' thoughts on introducing filtering; further, it analyzes the cause of introducing filtering in the context of demographics, Internet usages, and online activities. Through this process, this study considers a dead angle to use the filtering system for child protection. This study also points out that currently there are many online risks, which include not only illegal information such as pornographic and violent materials but also cyber bullying and online sexual predators. Filtering is far from perfect in terms of avoiding such dangers. Therefore, this study concludes that parents have to lay down rules for Internet usage as well as teach their children online etiquettes.

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