How to tell if document is encrypted

[Brent Snyder]

How can I tell if a document is encrypted?  I need to know to be able to prompt my user for a password.

[Praveenkumar H]

Hi Brent,

Thank you for using Syncfusion products,

We can add the security settings to the document as follow.

PdfDocument doc=new PdfDocument();

// Set encryption key. 

doc.Security.KeySize = PdfEncryptionKeySize.Key128Bit; 

doc.Security.Algorithm = PdfEncryptionAlgorithm.AES;

// Setting username and password to protect the document. 

doc.Security.OwnerPassword = "syncfusion"; 

doc.Security.UserPassword = "password"; 

// Allow print with full quality. 

doc.Security.Permissions = PdfPermissionsFlags.Print | PdfPermissionsFlags.FullQualityPrint; 

doc.Save("sample.pdf");

Please visit the below link for more information about the Pdf security.

http://help.syncfusion.com/ug/wpf/pdf/default.htm#!Documents/securitysettings.htm

Please let us know if you have any concern,

With Regards,

Praveen