[41] [DFN[PICS]] は、 [[Web]] における [[rating]] の手法として提案されていたものでした。

[42] 90年代に一瞬だけ流行しましたが、意味のある使われ方をされず、廃れました。

* プロトコル

[FIG(short list)[
- [CODE(HTTP)@en[[[PICS-Label:]]]]
- [CODE(HTTP)@en[[[Protocol:]]]]
- [CODE(HTTP)@en[[[Protocol-Request:]]]]
- [CODE(MIME)@en[[[application/pics-labels]]]]
- [CODE(MIME)@en[[[application/pics-service]]]]
- [CODE[rating][rating (RSS)]]
]FIG]

* 歴史

[1]
[CITE@en[draft-pics-services-00 - Rating Services and Rating Systems (and Their Machine Readable Descriptions)]] ([CODE[2007-01-27 23:38:24 +09:00]] 版) <http://tools.ietf.org/html/draft-pics-services-00>

[3]
[CITE@en[draft-pics-labels-00 - Label Syntax and Communication Protocols]] ([CODE[2007-01-27 23:44:46 +09:00]] 版) <http://tools.ietf.org/html/draft-pics-labels-00>

[4]
[CITE[Re: Question about the PICS label in HTML5]] ([[Phil Archer <parcher@...>]] 著, [TIME[2008-04-17 08:37:30 +09:00]] 版) <http://permalink.gmane.org/gmane.org.w3c.whatwg.discuss/13746>

[5] [CITE[PICS Superseded by POWDER]]
( ([TIME[2009-11-25 19:43:28 +09:00]] 版))
<http://www.w3.org/2009/08/pics_superseded.html>

[6] [CITE[REC-PICS-labels-961031]]
( ([TIME[2000-09-09 01:13:50 +09:00]] 版))
<http://www.w3.org/TR/REC-PICS-labels-961031>

[7] [CITE[REC-PICS-labels-961031]]
( ([TIME[2009-11-25 03:23:30 +09:00]] 版))
<http://www.w3.org/TR/2009/REC-PICS-labels-20091124/>

[8] [CITE[IRC logs: freenode / #whatwg / 20100409]]
([TIME[2010-04-22 01:12:18 +09:00]] 版)
<http://krijnhoetmer.nl/irc-logs/whatwg/20100409#l-466>

[REFS[
- [9] [CITE[REC-PICS-services-961031]] ([TIME[2009-11-25 03:23:30 +09:00]] 版) <http://www.w3.org/TR/REC-PICS-services/>
]REFS]

[10] >>9 には2009年11月24日付けで、 [[POWDER]] により [[PICS]] は廃止されたとあります。

[11] [CITE[PICS Extensions]]
( ([TIME[1998-03-28 07:58:37 +09:00]] 版))
<http://www.w3.org/PICS/extensions/>

[12] [CITE[cookieinfo-1_0.html]]
( ([TIME[1998-06-04 03:08:28 +09:00]] 版))
<http://www.w3.org/PICS/extensions/cookieinfo-1_0.html>

[13] [CITE[Resource Reference Information 1.0 Extension]]
( ([TIME[1998-03-28 05:53:32 +09:00]] 版))
<http://www.w3.org/TR/1998/PR-DSig-label-19980327/resinfo-1_0>

[14] [CITE[Sigblock Extension]]
( ([TIME[1998-03-28 05:52:57 +09:00]] 版))
<http://www.w3.org/TR/1998/PR-DSig-label-19980327/sigblock-1_0>

[15] [CITE[PICS Signed Labels (DSig) 1.0 Specification]]
( ([TIME[2013-05-29 05:46:27 +09:00]] 版))
<http://www.w3.org/TR/REC-DSig-label/>

[16] [CITE[PICSRules Specification]]
([TIME[2000-03-13 23:37:13 +09:00]])
<https://www.w3.org/TR/REC-PICSRules-971229>

[17] [CITE[PICSRules Specification]]
([TIME[1997-12-30 23:07:24 +09:00]])
<https://www.w3.org/TR/REC-PICSRules-971222>

[18] [CITE@en[Obsoleting some specifications]]
([[chaals@yandex-team.ru]]著, [TIME[2017-04-26 11:32:27 +09:00]])
<https://lists.w3.org/Archives/Public/www-tag/2017Apr/0010.html>

[19] [CITE[PICS, Censorship, and Intellectual Freedom FAQ]]
([[Paul Resnick]]著, [TIME[2000-02-25 01:57:46 +09:00]])
<https://www.w3.org/PICS/PICS-FAQ-980126.html>

[20] [DFN[PICS-NG]] の構文は、その後 [[RDF]] へと発展しました。


[21] [CITE[PICS-NG Metadata Model and Label Syntax]]
([[Ora Lassila]]著, [TIME[2000-03-13 23:37:14 +09:00]])
<https://www.w3.org/TR/NOTE-pics-ng-metadata>

[22] [CITE[W3C Next Generation Labels Working Group]]
([TIME[2014-02-25 08:07:45 +09:00]])
<https://www.w3.org/PICS/NG/>

[23] [CITE[DRAFT-PICS-services-970620]]
([TIME[1998-06-04 03:16:40 +09:00]])
<https://www.w3.org/PICS/Member/NG/DRAFT-PICS-services-970620.html>

[24] [CITE[PICS Extensions]]
([TIME[1998-03-28 07:58:37 +09:00]])
<https://www.w3.org/PICS/extensions/>

[25] [CITE[Extension to Identify Label Bureau]]
([TIME[1998-01-04 02:07:43 +09:00]])
<https://www.w3.org/PICS/extensions/label-bureau.html>

[26] [CITE[cookieinfo-1_0.html]]
([TIME[1998-06-04 03:08:28 +09:00]])
<https://www.w3.org/PICS/extensions/cookieinfo-1_0.html>

[29] [CITE[PICS Labels]]
([TIME[1996-12-09 12:31:01 +09:00]])
<https://www.w3.org/PICS/labels.html>

[30] [CITE[REC-PICS-services-961031]]
([TIME[2009-11-25 03:23:30 +09:00]])
<https://www.w3.org/TR/REC-PICS-services/>

[31] [CITE[REC-PICS-services-961031]]
([TIME[1998-04-08 06:12:20 +09:00]])
<https://www.w3.org/TR/REC-PICS-services-961031>

[32] [CITE[REC-PICS-services-961031]]
([TIME[1998-04-08 06:12:20 +09:00]])
<https://www.w3.org/TR/REC-PICS-services-961031>

[36] [[DSig]]


[27] [CITE[REC-PICS-services-961031]]
([TIME[1998-04-08 06:12:20 +09:00]])
<https://www.w3.org/TR/REC-PICS-services-961031.html>

[28] [CITE[REC-PICS-labels-961031]]
([TIME[1998-04-08 06:14:06 +09:00]])
<https://www.w3.org/TR/REC-PICS-labels-961031.html>

[33] [CITE[PICS-NG Metadata Model and Label Syntax]]
([[Ora Lassila]]著, [TIME[2000-03-13 23:37:14 +09:00]])
<https://www.w3.org/TR/NOTE-pics-ng-metadata>

[34] [CITE[PICS-NG Metadata Model and Label Syntax]]
([[Ora Lassila]]著, [TIME[2000-03-13 23:37:14 +09:00]])
<https://www.w3.org/TR/NOTE-pics-ng-metadata-970514.html>

[35] [CITE[PICS-NG Label Syntax Proposal]]
([TIME[1997-02-21 01:07:07 +09:00]])
<https://www.w3.org/PICS/draft-lassila-pics-ng-label-syntax.html>

[37] [CITE@en[Notes on Linked Data, terminology and marketing]]
([[Dan Brickley]]著, [TIME[2012-10-28 05:23:01 +09:00]])
<https://lists.w3.org/Archives/Public/www-archive/2012Oct/0119.html>

[38] [CITE[NOTE-PICS-Statement-980601.html]]
([TIME[2000-03-13 23:38:29 +09:00]])
<https://www.w3.org/TR/NOTE-PICS-Statement>

[39] [CITE[NOTE-PICS-Statement-980601.html]]
([TIME[2000-03-13 23:38:29 +09:00]])
<https://www.w3.org/TR/1998/NOTE-PICS-Statement-19980601.html>

[40] [CITE["PICS 1.x Changes to support digital libraries (& signatures)"]]
([TIME[1997-01-28 06:44:59 +09:00]])
<https://www.w3.org/PICS/970113/DigiLib/pics970113.htm>