The new circular, of which AFP obtained a copy Wednesday, stipulates blogs are to display private content, and must not "provide, transmit or have direct links" to information that would violate another regulation from earlier this year.
That regulation bans online behaviour that "opposes the state... undermines national security and social order and safety," causes conflict, or discloses national security, military or economic secrets.
Thanh Nien newspaper earlier said this month that authorities would contact Internet giants Google and Yahoo! for their cooperation "in creating the best and healthiest environment for bloggers."
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