A PDF document encrypted with a user password legally cannot be opened without the password. We’d better detect if a document is password protected or not before we try to open it. This article presents how to determine if a PDF document is encrypted with password using Spire.PDF in C#, VB.NET.
Code Snippet:
Step 1: Initialize an instance of PdfDocument class.
PdfDocument doc = new PdfDocument();
Step 2: Load a sample PDF document.
doc.LoadFromFile(@"C:\Users\Administrator\Desktop\Encrypted.pdf");
Step 3: Detect whether the document is encrypted with password or not.
bool isEncrypted = doc.IsEncrypted; Console.WriteLine(isEncrypted);
Result:
Full Code:
[C#]
using Spire.Pdf;
using System;
namespace Detect
{
class Program
{
static void Main(string[] args)
{
PdfDocument doc = new PdfDocument();
doc.LoadFromFile(@"C:\Users\Administrator\Desktop\Encrypted.pdf");
bool isEncrypted = doc.IsEncrypted;
Console.WriteLine(isEncrypted);
Console.Read();
}
}
}
[VB.NET]
Imports Spire.Pdf
Namespace Detect
Class Program
Private Shared Sub Main(args As String())
Dim doc As New PdfDocument()
doc.LoadFromFile("C:\Users\Administrator\Desktop\Encrypted.pdf")
Dim isEncrypted As Boolean = doc.IsEncrypted
Console.WriteLine(isEncrypted)
Console.Read()
End Sub
End Class
End Namespace
