If this property is set to a non- value, then also SignatureValidLayer property must be set to a non- value for Adobe Reader to show the run-time created signature validity icon.

At runtime, Adobe Reader replaces the SignatureInvalidLayer with the dynamically created 100 pt x 100 pt layer that shows 'Signature invalid' icon if the signature is invalid.

Default value: .

Namespace: SautinSoft.Pdf.Forms
Assembly: SautinSoft.Pdf (in SautinSoft.Pdf.dll) Version: 2025.6.5

Syntax

Copy

public PdfForm SignatureInvalidLayer { get; set; }

Public Property SignatureInvalidLayer As PdfForm
	Get
	Set

Property Value

PdfForm
The validity layer used for the 'Signature invalid' state.

Remarks

Note
Prior to Adobe Acrobat 6.0 (released in July 2003), signature appearances were manipulated at run-time in order to display the validity of the signature. The validity was shown as a graphic icon and with an additional, optional text message. The manipulated portions of the signature appearance were contained in SignatureValidLayer, SignatureInvalidLayer and ValidityTextLayer. Beginning with version 6, Adobe Acrobat does not maintain support for signature appearances that can be manipulated, though legacy signatures with these appearances may continue to display correctly. Use of SignatureValidLayer, SignatureInvalidLayer, and ValidityTextLayer is not recommended because support of these layers in future versions of Adobe Acrobat may be discontinued at any time. Some applications will specifically warn against the presence of signatures with these layers because, for conformance with various signed document standards, signature appearances should be static.

Note

Prior to Adobe Acrobat 6.0 (released in July 2003), signature appearances were manipulated at run-time in order to display the validity of the signature. The validity was shown as a graphic icon and with an additional, optional text message. The manipulated portions of the signature appearance were contained in SignatureValidLayer, SignatureInvalidLayer and ValidityTextLayer. Beginning with version 6, Adobe Acrobat does not maintain support for signature appearances that can be manipulated, though legacy signatures with these appearances may continue to display correctly. Use of SignatureValidLayer, SignatureInvalidLayer, and ValidityTextLayer is not recommended because support of these layers in future versions of Adobe Acrobat may be discontinued at any time. Some applications will specifically warn against the presence of signatures with these layers because, for conformance with various signed document standards, signature appearances should be static.

Reference

PdfSignatureAppearance Class

SautinSoft.Pdf.Forms Namespace