How can I remove PDF password?

Question

Hi guys, recently I've got a really annoying problem at work. Some of my PDFs can not be copyed, edited or printed. I know that's because they're secured but how can I remove the password? Any idea to work out the problem?

Answer 1

Hello,
As there is no any C# solution ,I would like to psot some sample codes to achieve this.
using Spire.Pdf;
using Spire.Pdf.Security;
namespace modify_PDF_passwords
class Program
static void Main(string[] args)
//load a encrypted file and decrypt it
String encryptedPdf = @"..\Encrypt.pdf";
PdfDocument doc = new PdfDocument(encryptedPdf, "e-iceblue");
//reset PDF passwords and set user password permission
doc.Security.OwnerPassword = "Spire.PDF";
doc.Security.UserPassword = "pdfcomponent";
doc.Security.Permissions = PdfPermissionsFlags.Print | PdfPermissionsFlags.FillFields;
//Save pdf file.
doc.SaveToFile("Encryption.pdf");
doc.Close();
//Launching the Pdf file.
System.Diagnostics.Process.Start("Encryption.pdf");
Anyway ,it is a PDF component based solution,which works pretty fine for me.
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