Move Unmarker

Very small CLI utility to remove PII watermarks from pdfs downloaded from Move USP/ESALQ, using PyMuPDF.

Beware that there is no input sanitization or error checking, you are on your own. This tool will run, as opposed to work, without fail on any pdf that has at least one content stream per page, which is basically every pdf in the wild. Unless the pdf has a watermark corresponding to the 2nd content stream of every page this will either do nothing (with the exception of changing compression options and maybe other idiosyncrasies of PyMuPDF when it comes to writing a pdf) or, in case it does have a 2 or more content streams on a page, it will keep just the first and likely make the file useless, though it will still open. Most pdf writers concatenate multiple content streams into one, so chances are it won't do anything or just crash.
This tool will overwrite without confirmation any file with the same name as --output (default "unmarked.pdf").

Installation

1. Make sure Python 3.8 or higher and pip are installed
2. Run pip install move-unmarker

Usage

usage: unmarker [-h] [-o OUTPUT] [-g GARBAGE] input

Utility to remove PII watermarks from pdfs downloaded from Move USP/ESALQ.

positional arguments:
input                   input filename

options:
-h, --help              show this help message and exit
-o OUTPUT, --output OUTPUT
                        output filename (default: "unmarked.pdf")
-g GARBAGE, --garbage GARBAGE
                        level of garbage collection (default: 1)  

pymupdf.Document.save method for more details on garbage collection.

TLDR

• unmarker watermarked.pdf
• unmarker -o unmarked.pdf watermarked.pdf
• unmarker --garbage 3 watermarked.pdf

Development

1. Check Python's version python -V

2. Install Python 3.8 or higher and pip, if they aren't already installed:

   • Windows winget install Python.Python.3.X (replace X with the desired minor version)
   • Ubuntu/Debian based distros apt install python3 python3-pip
   • Arch based distros pacman -S python python-pip
   • Fedora dnf install python3 python3-pip

3. Install poetry

4. Clone this repo
   git clone https://github.com/joaofauvel/move-unmarker.git && cd move-unmarker

5. Install requirements
   poetry install