PDF Password Locker and Remover software (version 3.3.1.0) is a tool designed for encrypting and decrypting PDF files. The software allows users to set passwords to protect their PDF files from unauthorized access. It also has the ability to remove passwords from protected PDF files, making it easier for users to access their documents without the need for a password. Additionally, the software supports batch processing, allowing users to encrypt or decrypt multiple PDF files at once.