Although it is not illegal to publish gun designs on the Internet, the agency asked the Internet Hotline Center to act after the arrest of a man by Kanagawa prefectural police in May on a charge of possessing a gun manufactured by a 3-D printer with data acquired online.
The IHC has been implementing this and other monitoring actions since Friday after the agency demanded changes in its guidelines for requesting removal of online material, according to the agency.
The new purge list includes information promoting voyeurism and stalking and on how to obtain copies of resident registration cards illegally.
Since July, a voluntary watchdog set up by Net businesses called the
Both organizations will alert the police about the sites they blacklist.
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