PDF file protection

tadej plibersek

Hello everyone,

I want to save multiple pdf's...and want to protect them somehow. I want to export pdfs with one application and somehow add some sort of script behind that protect them. I want also grant access to specific users.
Does anybody know something more about pdf security and how things works.

thank you in advance...

Regards, Tadej

2 Replies

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Leon D5y ago
You can intstall Spire.PDF library via nuget (https://www.nuget.org/packages/Spire.PDF/) and use the following cde to protect PDF:
using Spire.Pdf;
using Spire.Pdf.Security;

namespace EncryptPDF
{
    class Program
    {
        static void Main(string[] args)
        {
            //load the document from file
            PdfDocument pdf = new PdfDocument();
            pdf.LoadFromFile("Sample.pdf");

            //encrypt the PDF file
            pdf.Security.Encrypt("open", "permission", PdfPermissionsFlags.Print | PdfPermissionsFlags.CopyContent, PdfEncryptionKeySize.Key128Bit);

            //save the document to file
            pdf.SaveToFile("Encrypted.pdf", FileFormat.PDF);
        }
    }
}
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Kurt Ambrose5y ago
Using the LEADTOOLS SDK you could create your own application to create a password and choose an encryption for your PDF by using the PDFFile.SecurityOptions property to set the desired password and encryption . Do note this is a paid for SDK and I work for this vender. Here is some additional information on setting a password for your PDF to be exported.

https://www.leadtools.com/help/sdk/v21/dh/pdf/pdffile-securityoptions.html

Additionally here is a small code snippet of how this would work.
PDFFile pdfFile = new PDFFile(sourceFileName);

pdfFile.SecurityOptions = new PDFSecurityOptions();
pdfFile.SecurityOptions.OwnerPassword = "Password";
pdfFile.SecurityOptions.PrintEnabled = false;
pdfFile.SecurityOptions.CopyEnabled = false;
pdfFile.SecurityOptions.HighQualityPrintEnabled = false;
pdfFile.SecurityOptions.EncryptionMode = PDFEncryptionMode.RC128Bit;

// Encript the file by saving it to the destination file
pdfFile.Convert(1, -1, destinationFileName);
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