How to change security permission of a PDF using C# and VB.NET?
Syncfusion Essential PDF is a .NET PDF library used to create, read, and edit PDF documents. Using this library, you can change security permission of PDF using C# and VB.NET.
Steps to change security permission of PDF programmatically:
- Create a new C# console application project.
- Install the Syncfusion.Pdf.WinForms NuGet package as reference to your .NET Framework application from NuGet.org.
- Include the following namespaces in the Program.cs file.
C#
using Syncfusion.Pdf.Parsing; using Syncfusion.Pdf.Security;
VB.NET
Imports Syncfusion.Pdf.Parsing Imports Syncfusion.Pdf.Security
- Use the following code snippet to change security permission of the PDF document.
C#
//Load the password protected PDF document
PdfLoadedDocument loadedDocument = new PdfLoadedDocument("Input.pdf", "Syncfusion");
//Change the permission
loadedDocument.Security.Permissions = PdfPermissionsFlags.CopyContent | PdfPermissionsFlags.AssembleDocument;
//Save the PDF document
loadedDocument.Save("SecurityPermission.pdf");
//Close the PDF document
loadedDocument.Close(true);
//This will open the PDF file so, the result will be seen in default PDF viewer
Process.Start("SecurityPermission.pdf");
VB.NET
'Load the password protected PDF document
Dim loadedDocument As New PdfLoadedDocument("Input.pdf", "Syncfusion")
'Change the permission
loadedDocument.Security.Permissions = PdfPermissionsFlags.CopyContent Or PdfPermissionsFlags.AssembleDocument
'Save the PDF document
loadedDocument.Save("SecurityPermission.pdf")
'Close the PDF document
loadedDocument.Close(True)
'This will open the PDF file so, the result will be seen in default PDF viewer
Process.Start("SecurityPermission.pdf")
You can download the working sample from PDFSecuritySample.zip.
By executing the program, you will get the PDF document’s security settings as follows. 
Take a moment to peruse the documentation, where you can find other options like protect an existing PDF document, change and remove password of the PDF document, and the features like digitally sign a PDF file and adding a timestamp in a digital signature with code examples.
Refer here to explore the rich set of Syncfusion Essential PDF features.
Starting with v16.2.0.x, if you reference Syncfusion assemblies from trial setup or from the NuGet feed, include a license key in your projects. Refer to link to learn about generating and registering Syncfusion license key in your application to use the components without trail message.
Conclusion
I hope you enjoyed learning about how to change security permission of a PDF using C# and VB.NET.
You can refer to our PDF feature tour page to know about its other groundbreaking feature representations. You can also explore our documentation to understand how to create and manipulate data.
For current customers, you can check out our components from the License and Downloads page. If you are new to Syncfusion, you can try our 30-day free trial to check out our other controls.
If you have any queries or require clarifications, please let us know in the comments section below. You can also contact us through our support forums, Direct-Trac, or feedback portal. We are always happy to assist you!
