A more thorough explanation:

Ex debito justitiae is a Latin term that means "from or as a debt of justice." It refers to something that is done in accordance with the requirement of justice, as a matter of right.

• When a person is wrongfully accused of a crime, they have the right to a fair trial ex debito justitiae.
• Employees have the right to receive their wages ex debito justitiae for the work they have done.

These examples illustrate how ex debito justitiae refers to something that is owed or required by justice. In the first example, a fair trial is required by justice to ensure that the accused person's rights are protected. In the second example, employees have a right to be paid for their work, and this is owed to them by their employer as a matter of justice.