Why does this PDF show a signature in Foxit Reader but not Adobe Reader?
Here is the code from the Syncfusion PDF library used to generate it (see also documentation about signing an existing document):
var signature = new PdfSignature(loadedDocument, page, certificate, "Signature");
signature.Certificate = certificate;
signature.Bounds = new RectangleF(100, 100, 200, 200);
signature.Appearence.Normal.Graphics.DrawRectangle(PdfBrushes.Red, new RectangleF(0, 0, 200, 200));
When I use this on an existing PDF a signature is identified in Foxit Reader:
But not in Adobe Reader:
Here is the resulting PDF for analysis.
Why is this? Is there anything I can do to fix this so that Adobe will recognize it?
EDIT
Here is the original PDF before anything is done to it.
SOLUTION
I used the Nuget package from Syncfusion's own Nuget server, which is up to date (the ones on Nuget.org are not).