Lock and Unlock PDF Files with Password using C#
Let us learn to secure our documents from unauthorized access. Previously we discussed [adding text and image watermarks to the documents][1] 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