Hello Lukas,
Thanks for your patience.
The header is not required in XML file because we don't use such headers in Aspose.License.BlackList.xml of any other product as well. In fact this issue occurred because of a broken script, which placed Aspose.License.BlackList.xml into incorrect directory within jar, so the product was not able to read it. More along, when we have removed Aspose.License.BlackList.xml from /com/aspose/metafiles/resources directory, Aspose.Metafiles for Java is throwing same exception as you have specified earlier.
The checksum error is occurring because once you have modified the XML file in signed jar, it does not match with the signature present inside it. Please try using the updated product version and in case you still face any problem, please do let us know. We are sorry for this delay and inconvenience
Nayyer Shahbaz
Support Developer, Aspose Sialkot Team
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