olemus
ISO/IEC 27011:
sideettevõttes
inimkäsitletavana edastatava teabe
olemasolu, sisu, allika, kuupäeva ja kellaaja
paljastamatus
=
Properties of communications being handled by the persons engaged in the telecommunications organization should not be disclosed in terms of the existence, the content, the source, the destination and the date and time of communicated information.

ülevaateid
http://www.statewatch.org/news/2006/jul/ripa-part1.pdf

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/383548/DraftCDAcquisitionCodeofPracticeforconsultation.pdf

standard
https://www.iso.org/obp/ui/#iso:std:iso-iec:27011:ed-1:v1:en