PDF file protection

Sign in to answer this question.

• LD

  Leon D5y agoPosted May 17, 2021, 1:16 AM

  You can intstall Spire.PDF library via nuget (https://www.nuget.org/packages/Spire.PDF/) and use the following cde to protect PDF:

  1. using Spire.Pdf;  
  2. using Spire.Pdf.Security;  
  3.   
  4. namespace EncryptPDF  
  5. {  
  6.     class Program  
  7.     {  
  8.         static void Main(string[] args)  
  9.         {  
  10.             //load the document from file  
  11.             PdfDocument pdf = new PdfDocument();  
  12.             pdf.LoadFromFile("Sample.pdf");  
  13.   
  14.             //encrypt the PDF file  
  15.             pdf.Security.Encrypt("open", "permission", PdfPermissionsFlags.Print | PdfPermissionsFlags.CopyContent, PdfEncryptionKeySize.Key128Bit);  
  16.   
  17.             //save the document to file  
  18.             pdf.SaveToFile("Encrypted.pdf", FileFormat.PDF);  
  19.         }  
  20.     }  
  21. }  

   
• KA

  Kurt Ambrose5y agoPosted May 14, 2021, 3:22 PM

  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.

  
  

  1. PDFFile pdfFile = new PDFFile(sourceFileName);  
  2.   
  3. pdfFile.SecurityOptions = new PDFSecurityOptions();  
  4. pdfFile.SecurityOptions.OwnerPassword = "Password";  
  5. pdfFile.SecurityOptions.PrintEnabled = false;  
  6. pdfFile.SecurityOptions.CopyEnabled = false;  
  7. pdfFile.SecurityOptions.HighQualityPrintEnabled = false;  
  8. pdfFile.SecurityOptions.EncryptionMode = PDFEncryptionMode.RC128Bit;  
  9.   
  10. // Encript the file by saving it to the destination file  
  11. pdfFile.Convert(1, -1, destinationFileName);