PDF password protect

4 posts in this topic

I have valuable scanned documents in PDF format. I copy them to a shared folder for my clients to view, they are not allowed to print and edit anything on my documents. Most PDF readers have a Security feature to password protect your files and I use it to do the job perfectly. The problem is that I have about 4000 pdf files and it will take me forever to password protect them one by one. What I am looking for is something that will password protect multiple files or an executable that will automatically password protect files that are copied to the shared folder. I am a rookie at AutoIT but would really appreciate any help given.

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#3 ·  Posted (edited)

You can use QuickPDF Library.

Look in my signature.


or just click here:


Edited by mLipok

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#4 ·  Posted (edited)

Thank you for the help. I've managed to do it in C#, I just had to include PDFSharp library

Here's what I did (It worked perfectly)

static void Main(string[] args)
   FileSystemWatcher watcher = new FileSystemWatcher();
   watcher.Path = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile) + @"\documents\";
   watcher.Filter = "*.pdf";
   watcher.IncludeSubdirectories = true;
   watcher.Created += new FileSystemEventHandler(fw_Created);
   watcher.EnableRaisingEvents = true;

  static void fw_Created(object sender, FileSystemEventArgs e)
   string path = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile) + @"\documents";
   PdfDocument document = PdfReader.Open(path + "\\" + e.Name, "");

   PdfSecuritySettings securitySettings = document.SecuritySettings;

   // Setting one of the passwords automatically sets the security level to 
   // PdfDocumentSecurityLevel.Encrypted128Bit.
   //securitySettings.UserPassword = "yourUserPassword";
   securitySettings.OwnerPassword = "yourOwnerPassword";

   // Don't use 40 bit encryption unless needed for compatibility reasons
   //securitySettings.DocumentSecurityLevel = PdfDocumentSecurityLevel.Encrypted40Bit;

   // Restrict some rights.
   securitySettings.PermitAccessibilityExtractContent = false;
   securitySettings.PermitAnnotations = false;
   securitySettings.PermitAssembleDocument = false;
   securitySettings.PermitExtractContent = false;
   securitySettings.PermitFormsFill = false;
   securitySettings.PermitFullQualityPrint = false;
   securitySettings.PermitModifyDocument = false;
   securitySettings.PermitPrint = false;

   // Save the document...
   document.Save(path + "\\" + e.Name);


Edited by STaufa
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