com/en-us/windows/msix/package/packaging-uwp-apps ) If you're publishing your app in Microsoft Store, your app will be signed with a trusted certificate for you. The app package must be digitally signed for signature validation An update was made to the PDF specification (ISO-32000) to accommodate a document timestamp signature that tells the validating app (in this case Acrobat, but it could be any PDF viewer that wants to do signature validation) to get the time-slice from the timestamp token in the signed attributes of the CMS package. _ The app package must be digitally signed for signature validation
