49 CFR §1333.5

In addition to providing the minimum information on or with demurrage invoices, Class I carriers shall provide machine-readable access to the information listed in § 1333.4. For purposes of this part, `machine-readable' means data in an open format that can be easily processed by computer without human intervention while ensuring no semantic meaning is lost. An `open format' is a format that is not limited to a specific software program and not subject to restrictions on re-use.