When I use Acrobat 6.0, click the signature, and click Signature Properties, why do I get a bad parameter error in Acrobat?

Try to assign the nonempty value to the ElPDFSignature.AuthorName property. Though this property is marked as optional in the PDF specification, Adobe Reader 6 fails to validate signatures with an empty AuthorName (this error is fixed in Adobe Reader 7).

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