Largely abandoned format for declaring website's privacy policy in machine-readable format. The only reason for many websites to use the header was that old versions of Microsoft Internet Explorer disallowed third-party cookies on websites missing P3P.

Reference...

We have seen 4977 websites setting the P3P HTTP header and 733 unique values of this header.

  • rbnt.org CP="NOI ADM DEV PSAi COM NAV OUR OTRo STP IND DEM"
  • www.google.com policyref="https://www.googleadservices.com/pagead/p3p.xml", CP="NOI DEV PSA PSD IVA IVD OTP OUR OTR IND OTC"
  • www.wp.pl CP="ALL DSP COR CUR ADM DEV TAI PSA PSD IVA IVD CON TEL OUR SAM IND"
  • www.youtube.com CP="This is not a P3P policy! See http://support.google.com/accounts/answer/151657?hl=en for more info."
  • s.yimg.com policyref="https://policies.yahoo.com/w3c/p3p.xml", CP="CAO DSP COR CUR ADM DEV TAI PSA PSD IVAi IVDi CONi TELo OTPi OUR DELi SAMi OTRi UNRi PUBi IND PHY ONL UNI PUR FIN COM NAV INT DEM CNT STA POL HEA PRE LOC GOV"
  • adultfriendfinder.com CP="DSP LAW"
  • sites.google.com CP="This is not a P3P policy! See g.co/p3phelp for more info."
  • www.krone.at CP="ALL IND DSP COR ADM CONo CUR CUSo IVAo IVDo PSA PSD TAI TELo OUR SAMo CNT COM INT NAV ONL PHY PRE PUR UNI"
  • ad1.adfarm1.adition.com policyref="https://imagesrv.adition.com/w3c/p3p-ssl.xml",CP="NON DSP ADM DEV PSD IVDo OTPi OUR IND STP PHY PRE NAV UNI"
  • p.crm4d.com CP="NOI DSP COR CURa DEVa PSAa OUR STP UNI DEM"
  • adserver.adtech.de CP="NOI DSP DEVa OUR BUS UNI COM NAV INT"
  • trackad.cz CP="ALL IND DSP COR ADM CONo CUR CUSo IVAo IVDo PSA PSD TAI TELo OUR SAMo CNT COM INT NAV ONL PHY PRE PUR UNI"
  • c.imedia.cz CP="NON DSP COR TAI NOR UNI", policyref="/w3c/p3p.xml"
  • adfarm1.adition.com policyref="http://imagesrv.adition.com/w3c/p3p.xml",CP="NON DSP ADM DEV PSD IVDo OTPi OUR IND STP PHY PRE NAV UNI"
  • optimized-by.rubiconproject.com CP="NOI CURa ADMa DEVa TAIa OUR BUS IND UNI COM NAV INT"
  • securepubads.g.doubleclick.net policyref="https://googleads.g.doubleclick.net/pagead/gcn_p3p_.xml", CP="CURa ADMa DEVa TAIo PSAo PSDo OUR IND UNI PUR INT DEM STA PRE COM NAV OTC NOI DSP COR"
  • us-ads.openx.net CP="CUR ADM OUR NOR STA NID"
  • s1.adform.net CP="NOI DSP COR NID CURa ADMa DEVa TAIa PSAa PSDa OUR LEG NAV INT"
  • gacz.hit.gemius.pl CP="NOI DSP COR NID PSAo OUR IND"
  • cse.google.com CP="This is not a P3P policy! See g.co/p3phelp for more info."
  • adx.adform.net CP="NOI DSP COR NID CURa ADMa DEVa TAIa PSAa PSDa OUR LEG NAV INT"
  • pagead2.googlesyndication.com policyref="https://www.googleadservices.com/pagead/p3p.xml", CP="NOI DEV PSA PSD IVA IVD OTP OUR OTR IND OTC"
  • partner.shareaholic.com CP='OTI DSP COR DEVo ADMa OUR CONo IND COM INT ONL PUR STA OTC'
  • legeaz.net CP="NOI ADM DEV PSAi COM NAV OUR OTRo STP IND DEM"
  • gapt.hit.gemius.pl CP="NOI DSP COR NID PSAo OUR IND"