Access to certain websites and content may be limited on grounds of security, traditional culture, public health and national interest. For instance, contents about distortion of history, denial of Revolutionary achievements, undermining the Grand National Unity Block, prostitution; human trafficking; pornographic or criminal are prohibited. Plus, Internet services/social network providers and websites  are required to ensure that content published online do not contain any prohibited topics and where needed, to remove such contents out of their systems or services.