protected JsonObject optionalFooterData() throws CartInvalidCartException {
		JsonObject optionalFooterDataCopy;

		if (optionalFooterData != null) {
			optionalFooterDataCopy = optionalFooterData.deepCopy();
		}
		else {
			optionalFooterDataCopy = null;
		}

		return optionalFooterDataCopy;
	}
Get a copy of the optional footer data.

@return A copy of the JsonObject optional footer data or null if unavailable.
@throws CartInvalidCartException If the footer object is not valid.
Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/cart/CartV1Footer.java