Re: [office] encryption - signature

Patrick: https://issues.oasis-open.org/browse/OFFICE-3702
Patrick: Close with no action, there is no benefit to using the correct
URL - would cause unnecessary work and effort, plus possibly break prior
applications -
Jos van den Oever: Calligra uses '"http://www.w3.org/2000/09/xmldsig#sha1";'
Jos van den Oever: but not sha256