This tutorial explains how to hide specific pages in PDF file. You can select the PDF pages of your choice and then set a master password to hide those pages and create a separate output PDF. It is possible using a free software, known as “PDF Page Lock”.

This tutorial explains how to lock specific pages in PDF file. You can select custom pages of a PDF document and then lock them in a single click. When you will open the output PDF, you will find that the content of those pages is not visible.

This tutorial explains how to add and replace links in PDF file. You can search for a word available in PDF file and then add a link of your choice in that word. Apart from that, you can also replace all or selected links with a link of your choice in a PDF file.