Mechanisms and Schemesof deletion of Child Abuse
Materials
Chairman, Internet Contents Association
Vice Chair & Executive Director
Japan Internet Providers AssociationProfessor of The Kyoto College of Graduate Studies of Informatics
Toshiaki TateishiImage of Blocking
House A

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Normal Web site access and DNS activity (overview)www.example.com
IP address:10.1.1.1

ISP Network④ Browser (PC) requests abc.html from server (10.1.1.1)
ex. http://www.example.com/abc.html

DNS Server (in the ISP)
③ DNS server replies with the IP
address of the server in question
ex. www.example.com=10.1.1.1② Request the IP
address of thecorresponding server
from the DNS serverThis case iswww.example.com.

②③④Internet⑤⑤ Server (10.1.1.1)
sends abc.html tobrowser (PC)

① Input the URL
ex. http://www.example.com/abc.html
3DNS Blocking (overview)www.example.com
IP Address:10.1.1.1

ISP Network
DNS Server (in the ISP)
③ The DNS server responds with afictitious IP address for theconcerned server.
ex. www.example.com=10.1.1.2② Request the IP
address of the②corresponding server
from the DNS serverThis case iswww.example.com.

③④⑤⑤ Server (10.1.1.2)
notifies browser(PC) that it isblocked① Input the URL
ex. http://www.example.com/abc.html④ Browser (PC) requests abc.html from server (10.1.1.2)
ex. http://www.example.com/abc.html

Internet

www.example.com
IP Addredd:10.1.1.2

In this way, it is also possible not to notify the user that
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access is blocked, or not even to return a fake IP address.

DNS Blocked
www.example.com
IP Address:10.1.1.1

ISP Network

Not Here！

DNS Server (inside ISP)

INTERNETThe actual blocking or detection takes place just before
the user, not in the vicinity of the Server.
5

No Blocking(example)
House AOK!
I want to go tothe KARAOKE

Gate Keeper
exists 24h/365d6

Blocking(example)
House ANO!
Gate keeper exists 24h/365Days
I want to go tothe House A7

If we block in Japan. . .
Then, users outside Japan can access but Japanese can not.

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Blocking schemes as a measure against the sites (Japan)
Internet Hotline Center(IHC)
ReportInternet Contents Safety Association(ICSA)

Existence, investigation, and determinationof content

List

Create a list of addresses of sites that post child abusematerials.

Collect InformationUsers
Warning screen appears whenattempting to access a site
containing child porn materials.

STARTED 21st, Apr. 2011

ISPAutomaticInternet

Retrieve the list
weeklyUpdate the DNS->warning msg.

Ok

Ordinary site

Listed Site
ReportManagement of the LIST of Child Abuse Materials
Located in Japan

Located in Overseas
Check

Deleted By ISP
Police Investigation

Arrest the criminal

Validate
Create LISTCHECK WEEKY

Distribute the
LIST to ISPBLOCK sites
1011

Japan: UN rights expert warns of serious
threats to the independence of the press
The Japan TimesTOKYO / GENEVA (19 April 2016) – The United Nations Special Rapporteur on the right to freedom ofopinion and expression, David Kaye, on Tuesday called upon the Japanese Government to take urgent
steps to protect the independence of the media and promote the public's right of access to information.
“Japan has well-earned pride in a Constitution that expressly protects the freedom of the press. Yet theindependence of the press is facing serious threats,” said Kaye after a week-long visit to the country.
“I want to emphasize as well how important a model Japan presents in the area of freedom on theInternet," Kaye added. "The very low level of Government interference with digital freedoms illustrates
the Government’s commitment to freedom of expression. As the Government considers legislation
related to wiretaps and new approaches to cybersecurity, I hope that this spirit of freedom,
communication security and innovation online is kept at the forefront of regulatory efforts.”

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