class FileFormatError(Exception):
    """Raised when the format of given file is unsupported or unrecognized.
    """
    pass


class ParseError(Exception):
    """Raised when the file cannot be parsed correctly.
    """
    pass


class DecryptionError(Exception):
    """Raised when the file cannot be decrypted.
    """
    pass


class InvalidKeyError(DecryptionError):
    """Raised when the given password or key is incorrect or cannot be verified.
    """
    pass