"Unauthorised entry" refers to going into a place or accessing information without permission. It means entering somewhere or doing something that you are not allowed to do. Full definition
This includes deterring unauthorised entry by the use of signs and fencing, reviewing lighting as nearly all arson attacks occur in darkness, and ensuring that locks on doors and windows are of the appropriate standard. (educationbusinessuk.net)
In a statement Ms Malhotra described several incidents when people from the leader's office used electronic keys to gain «unauthorised entry into my office in parliament». (politicshome.com)
The key purpose of an intruder alarm system is to monitor and detect unauthorised entry to a premises, consequently alerting the police or other response services and / or authorised people — such as a caretaker, headmaster or key holding service — to attend the property as part of a response plan. (educationbusinessuk.net)