PDF on Solarized Sublime Sekai

Merge Two PDF to Single Encrypted PDF

Wed, 15 Mar 2023 17:47:14 +0100

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.

Encrypt PDF on Command Line

Sat, 04 Mar 2023 14:45:05 +0100

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. It can be tedious to rename them according to your own habits. To protect users’ privacy, we can

PDF Form Printing Error

Sun, 16 Sep 2018 01:57:12 +0200

Background

Le Temple du Marais

"Eglise verte" means "green church".

My churches are going green.

Problem

→ I downloaded a PDF from Haute-Garonne’s government site, filled in the form and saved it on a USB key. Then I printed it at a Konica Minolta bizhub photocopier yesterday.

However, _only_ the radio buttons and checkboxes were printed. The blanks were left _blank_! I opened my PDF and double-checked that I had input the text in .

Printed output

Printed by a Konica Monilta bizhub photocopier

Combine PDF in Linux

Fri, 13 Jul 2018 17:30:54 +0200

pdfunite is fairly easy to use.

pdfunite PDF-sourcefile1..PDF-sourcefilen PDF-destfile

Another way is to use QPDF. I’ve learnt to add --empty from @qpdf/qpdf:#12.

qpdf --empty --pages *.pdf -- out.pdf