---
type: "term"
title: "Accessibility (Data Risk Event)"
description: "The operational state in which data or resources can be used for their intended purpose by authorized processes (Facility, IT, or Business processes)."
resource: "tlctc:term:accessibility-data-risk-event"
tags:
  - "glossary"
---
# Accessibility (Data Risk Event)

The operational state in which data or resources can be used for their intended purpose by authorized processes (Facility, IT, or Business processes). Loss of Accessibility occurs when data exists but cannot be used—such as encrypted files (ransomware), corrupted data, or permission lockouts. This is distinct from Loss of Availability: ransomware causes Loss of Accessibility (data present but unusable), not Loss of Availability (data gone or unreachable). DRE notation: `Ac` when distinguished from Availability, or `A` as general shorthand covering both.