Download PDF Protector, Splitter and Merger 1.0 for free. It is valid on 1/27 only. Here is a screenshot for your reference. Be sure to review the readme.txt file before installation. It provides the ability to set owner and user password to PDF files, split PDF files in batch process with multiple options, and merge multiple PDF files into one PDF file. This PDF Protector, Splitter and Merger usually goes for about $9.