// PM> Install-Package IronPdf
using IronPdf;
 


//Open an Encrypted File, alternatively create a new PDF from Html

using PdfDocument Pdf = PdfDocument.FromFile("encrypted.pdf", "password");

//Edit file metadata
Pdf.MetaData.Author = "Satoshi Nakamoto";
Pdf.MetaData.Keywords = "SEO, Friendly";
Pdf.MetaData.ModifiedDate = DateTime.Now;

//Edit file security settings

//The following code makes a PDF read only and will disallow copy & paste and printing
Pdf.SecuritySettings.RemovePasswordsAndEncryption();
Pdf.SecuritySettings.MakePdfDocumentReadOnly("secret-key");
Pdf.SecuritySettings.AllowUserAnnotations = false;
Pdf.SecuritySettings.AllowUserCopyPasteContent = false;
Pdf.SecuritySettings.AllowUserFormData = false;
Pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights;



// change or set the document encrpytion password
Pdf.Password = "my-password";
Pdf.SaveAs("secured.pdf");

' PM> Install-Package IronPdf
Imports IronPdf



'Open an Encrypted File, alternatively create a new PDF from Html

Private PdfDocument As using

'Edit file metadata
Pdf.MetaData.Author = "Satoshi Nakamoto"
Pdf.MetaData.Keywords = "SEO, Friendly"
Pdf.MetaData.ModifiedDate = DateTime.Now

'Edit file security settings

'The following code makes a PDF read only and will disallow copy & paste and printing
Pdf.SecuritySettings.RemovePasswordsAndEncryption()
Pdf.SecuritySettings.MakePdfDocumentReadOnly("secret-key")
Pdf.SecuritySettings.AllowUserAnnotations = False
Pdf.SecuritySettings.AllowUserCopyPasteContent = False
Pdf.SecuritySettings.AllowUserFormData = False
Pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights



' change or set the document encrpytion password
Pdf.Password = "my-password"
Pdf.SaveAs("secured.pdf")