Tag Archives: add password to PDF in csharp

Lock & Unlock PDF Files with Password using C#

Let's learn to secure our documents from unauthorized access. Previously we discussed adding text and image watermarks to the documents to avoid and illegal use. In this article, we will see how to add password protection to PDF documents to get them locked using C#. Additionally, we will change the existing password and also learn to remove the password to make the PDF unlocked.

The following topics are discussed in this article:

  • .NET API for Password Protection of PDF files
  • Lock PDF Files by adding Password
  • Change PDF Password in C#
  • How to Remove PDF Password - Unlock PDF
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