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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.
November 17, 2021 · 3 min · Shoaib Khan