Web Security, Privacy and Commerce, 2nd Edition
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Appendix D. The PICS Specification
The PICS specification introduced in Chapter 23 consists of two parts:
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A specification for the protocols that must be supported by a rating service. This specification is located at http://w3.org/PICS/services.html.
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A specification for the format of the labels themselves. This specification is located at http://w3.org/PICS/labels.html.
An excellent article describing PICS is "PICS: Internet Access Controls Without Censorship," by Paul Resnick and James Miller, Communications of the ACM, October 1996, p. 87. The online version of the article is at http://w3.org/PICS/iacwcv2.htm.
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