Industry Security Notice (ISN)

A list of Industry Security Notices (ISNs) for defence personnel to highlight security changes or information.


Definition of MOD Identifiable Information

MOD implementation of cyber essentials scheme

Guidance on securing technology at OFFICIAL

Marking of MOD commercial information

Government Security Classification Scheme

Defence Trade Cooperation Treaty (DTCT)

Defence Trade Cooperation Treaty (DTCT): application form

Social networking

Personal data handling


A Industry Security Notice (ISN) is an official document that tells people in industry about important instructions, guidance or other information relating to security.

Important notice

  • ‘ISN 2014/04 Farnborough International Air Show 2014: exhibition clearances’ has been removed
  • ‘ISN 2014/01: Government Security Classification Scheme’ updated April 2014
  • ‘ISN 2011/05 Defence & Security Equipment International (DSEi) 2011: exhibition clearances’ has been removed
  • ‘ISN 2011/02: incident report’ has been superseded by ‘2011/07: incident reporting’
  • ‘ISN 2011/03: Nato personnel security clearances’ has been superseded by ‘2014/03: Procedure for UK contractors to obtain Nato personnel security clearances’