A-PDF Password Security is a desktop utility program that lets you change password security of existing Acrobat PDF files. That means you can protect PDF files with 128 bit encryption or remove the password protection. It can handle either single or batch documents with a wizard. It can handle either single or batch documents. Another convenient features include password pool and hot directory. You can modify metadata at the same time also.
"I would like to add password to my PDF to prevent someone from opening my PDF files. Is there any way to add password easily but safely for a batch of PDF?"
Sometimes we will need to add password to PDF files for protection. If you would like to add a powerful password to PDF, you can make use of PDF Password Security.
PDF Password Security can add high level password to single PDF file, batch PDF files and PDF directory. You can select security level for your password: 40-bit, Acrobat 3.0 and above or 128-bit, Acrobat 5.0 and above. You can also set expiry date to the PDF files.
The following guide will show you how to add password to PDF with PDF Password Security:
Step 1: Add PDF files or PDF directory.
You can add single PDF document or add batch PDF documents, as well as PDF directory.
Step 2: Select security method.
Security level → permissions → edit properties → add expiry date
Step 3: Save encrypted PDF files.