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uh hello friends today in this tutorial ill be showing you that how to use the qr pdf library to encrypt any sort of pdf document with password using the child process module in you can also use its own command which is there in order to encrypt the pdf document the library name is qpdf its a c plus plus low level based library which uh is able to perform operations on pdf documents such as encryption decryption or any other stuff this its official website you will see that it has its own github repository you can read more about it the documentation is also given so in this tutorial guys we will be using how to use this library inside the nodejs so the very first thing guys you need to this library so simply write qr pdf download from this website you need to first of all download this i have already downloaded it inside my c directory so let me show you in the c directory i have created qr pdf folder and then inside the bin directory i have successfully added this path thi