fluidum · October 7, 2022 15:48
diff --git a/pdf_watermark_removal.txt b/pdf_watermark_removal.txt
 # Set a PDF password as variable because it might contain special symbols and it will break shell if not quoted
 PDF_PASSWORD='<space_holder>'
 # qpdf utility will help removing encryption. https://qpdf.readthedocs.io/
 qpdf --decrypt --password="$PDF_PASSWORD" encrypted.pdf unencrypted.pdf

 # Watermark can be removed PDF is not encrypted.

 # One type of watermarks in PDF-s are detected by lines that contain string BaseEncoding and what we will remove below.
 sed -i '/BaseEncoding/d' unencrypted.pdf

 # Validate your new outcome if its watermark free or not. If not then keep researching your solution.

 # Note: I noticed some cache issue when I had opened watermarked PDF previously in Windows 10 machine (new file was on another path). sha256sum was equal in Linux and Windows. In my case I uploaded file to sharepoint and watermark was successfully removed.
	# Set a PDF password as variable because it might contain special symbols and it will break shell if not quoted
	PDF_PASSWORD='<space_holder>'
	# qpdf utility will help removing encryption. https://qpdf.readthedocs.io/
	qpdf --decrypt --password="$PDF_PASSWORD" encrypted.pdf unencrypted.pdf

	# Watermark can be removed PDF is not encrypted.

	# One type of watermarks in PDF-s are detected by lines that contain string BaseEncoding and what we will remove below.
	sed -i '/BaseEncoding/d' unencrypted.pdf

	# Validate your new outcome if its watermark free or not. If not then keep researching your solution.

	# Note: I noticed some cache issue when I had opened watermarked PDF previously in Windows 10 machine (new file was on another path). sha256sum was equal in Linux and Windows. In my case I uploaded file to sharepoint and watermark was successfully removed.