def is_machine_readable_copyright(text):
    """
    Return True if a text is for a machine-readable copyright format.
    """
    return text and text[:100].lower().startswith((
        'format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0',
        'format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0',
    ))