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PDF Security: Change the signing part of the properties

Hi team,

How I can change security on a PDF I have developed, I need to change the signing part of the properties to - allowed, instead of not allowed.

Hi there,

Thanks for your inquiry. You can use PdfFileSecurity object to set privileges on existing PDF document. Please check following code snippet for enabling signing privilege and also visit documentation link for further details.

//create DocumentPrivileges object<o:p></o:p>

DocumentPrivilege privilege = DocumentPrivilege.ForbidAll;

privilege.AllowModifyAnnotations = true;

//open PDF document

PdfFileSecurity fileSecurity = new PdfFileSecurity();

fileSecurity.BindPdf(myDir + "input.pdf");

//set document privileges


fileSecurity.Save(myDir + "output.pdf");

Pelase feel free to contact us for any further assistance.

Best Regards,


Thanks for contacting support.

You may also consider using the new Document Object Model (DOM) of Aspose.Pdf namespace to accomplish your requirements. Please try using following code snippet.


<o:p> </o:p>

// Load a source PDF file

using (Document document = new Document("c:/pdftest/Test (4).pdf"))


// Instantiate Document Privileges object

// Apply restrictions on all privileges

DocumentPrivilege documentPrivilege = DocumentPrivilege.AllowAll;

// make any changes except page extraction

documentPrivilege.ChangeAllowLevel= 4;

// Encrypt the file with User and Owner password.

// Need to set the password, so that once the user views the file with user password,

// only screen reading option is enabled

document.Encrypt("user", "owner", documentPrivilege, CryptoAlgorithm.AESx128,true);

// Save updated document



When viewing the security permissions of resultant file, you will get information as specified in attached image. In case you encounter any issue, please share the resource PDF file.