Merge Two PDF to Single Encrypted PDF

 Posted on March 15, 2023  |  1 minutes  |  Vincent Tam  |   0 comment

Problem I have unprotected input1.pdf input2.pdf and I want to create one single encrypted.pdf. My try I looked up QPDF’s manual and tried the following command. qpdf --empty --pages input{1,2}.pdf --encrypt upw opw 256 -- encrypted.pdf but I got this error. qpdf: unrecognized argument --encrypt (pages options must be terminated with --) For help: qpdf --help=usage usage information qpdf --help=topic help on a topic qpdf --help=--option help on an option qpdf --help general help and a topic list Solution The sentence inside the parentheses says it all. [Read More]
PDF  QPDF 

Encrypt PDF on Command Line

 Posted on March 4, 2023  (Last modified on March 16, 2023)  |  2 minutes  |  Vincent Tam  |   0 comment

Background On M$ Win*, I don’t have dedicated PDF readers like Adobe. During visioconference, one might want to share some downloaded PDFs. Those documents can be part of an ebook or notes. In some situations, they can provide context to a discussion. Problem Under the same folder, you might have downloaded_ebook.pdf personal_info.pdf other_personal_stuff.pdf that you don’t want to expose while streaming. However, each downloaded PDF usually comes with a name set by others. [Read More]
PDF  QPDF