---
type: "term"
title: "Loss of Accessibility (LoAc)"
description: "A Data Risk Event outcome where data or resources exist and can be reached by the infrastructure, but cannot be used for their intended purpose by authorized processes."
resource: "tlctc:term:loss-of-accessibility-loac"
tags:
  - "glossary"
---
# Loss of Accessibility (LoAc)

A Data Risk Event outcome where data or resources exist and can be reached by the infrastructure, but cannot be used for their intended purpose by authorized processes. From the attacker's perspective: "Data locked / unusable". Examples: ransomware encryption, data corruption, permission lockout. DRE notation: `Ac` (refined) or `A` (general). Not to be confused with Loss of Availability (data gone or unreachable → `Av`).