A more thorough explanation:

Non infregit conventionem

Non infregit conventionem is a Latin term that means "he committed no breach of covenant." It is a plea used in a legal case where someone is accused of breaking a promise or agreement.

For example, if someone promised to pay rent on time every month and they did so, they could use the plea of non infregit conventionem if their landlord tried to sue them for breach of contract.

Another example would be if a company promised to deliver a product by a certain date and they did so, they could use this plea if the customer tried to sue them for not fulfilling their promise.

These examples illustrate how non infregit conventionem can be used as a defense in a legal case where someone is accused of breaking a promise or agreement.