VB.Net code to check if password is pdf protected

Below code is using iTextsharp api. It has many properties to check you can use as your need and saving to backup folder task can be done esily if you can google

Private Sub CheckPdfProtection(ByVal filePath As String)
Try
Dim reader As PdfReader = New PdfReader(filePath)
If Not reader.IsEncrypted() Then Return
If Not PdfEncryptor.IsPrintingAllowed(reader.Permissions) Then Throw New InvalidOperationException("the selected file is print protected and cannot be imported")
If Not PdfEncryptor.IsModifyContentsAllowed(reader.Permissions) Then Throw New InvalidOperationException("the selected file is write protected and cannot be imported")
Catch __unusedBadPasswordException1__ As BadPasswordException
Throw New InvalidOperationException("the selected file is password protected and cannot be imported")
Catch __unusedBadPdfFormatException2__ As BadPdfFormatException
Throw New InvalidDataException("the selected file is having invalid format and cannot be imported")
End Try
End Sub

2 Replies

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Rajanikant Hawaldar5y ago
Accepted answer
Below code is using iTextsharp api. It has many properties to check you can use as your need and saving to backup folder task can be done esily if you can google
Private Sub CheckPdfProtection(ByVal filePath As String)
    Try
        Dim reader As PdfReader = New PdfReader(filePath)
        If Not reader.IsEncrypted() Then Return
        If Not PdfEncryptor.IsPrintingAllowed(reader.Permissions) Then Throw New InvalidOperationException("the selected file is print protected and cannot be imported")
        If Not PdfEncryptor.IsModifyContentsAllowed(reader.Permissions) Then Throw New InvalidOperationException("the selected file is write protected and cannot be imported")
    Catch __unusedBadPasswordException1__ As BadPasswordException
        Throw New InvalidOperationException("the selected file is password protected and cannot be imported")
    Catch __unusedBadPdfFormatException2__ As BadPdfFormatException
        Throw New InvalidDataException("the selected file is having invalid format and cannot be imported")
    End Try
End Sub
Sachin Singh5y ago
use spire.doc , its easy to use.
https://www.e-iceblue.com/Tutorials/Spire.PDF/Spire.PDF-Program-Guide/Security/How-to-detect-if-a-PDF-document-is-password-protected-in-C-VB.NET.html