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Watermarks in PDFs can be removed by third-party tools. If you need watermarks that are very hard to remove, rasterize the document: convert pages to images so content becomes non-editable.
This sample converts all PDF pages to images (after adding a watermark) to lock down content and make subsequent removal extremely difficult.
import groupdocs.watermark as gw
import groupdocs.watermark.contents.pdf as gwc_pdf
import groupdocs.watermark.watermarks as gww
import groupdocs.watermark.common as gwc
load_options = gw.PdfLoadOptions()
with gw.Watermarker("document.pdf", load_options) as watermarker:
watermark = gww.TextWatermark("Do not copy", gww.Font("Arial", 8.0))
watermark.horizontal_alignment = gwc.HorizontalAlignment.CENTER
watermark.vertical_alignment = gwc.VerticalAlignment.CENTER
watermark.rotate_angle = 45
watermark.sizing_type = gww.SizingType.SCALE_TO_PARENT_DIMENSIONS
watermark.scale_factor = 1.0
watermark.opacity = 0.5
watermarker.add(watermark)
pdf_content = watermarker.get_content(gwc_pdf.PdfContent)
pdf_content.rasterize(100, 100, gwc_pdf.PdfImageConversionFormat.PNG)
watermarker.save("document.pdf")
WarningYou can’t restore document content after saving the document. Rasterization significantly increases the size of the resultant PDF file.
This sample rasterizes only a specified page of the PDF (with an applied watermark), leaving the rest of the document editable.
import groupdocs.watermark as gw
import groupdocs.watermark.contents.pdf as gwc_pdf
import groupdocs.watermark.watermarks as gww
import groupdocs.watermark.common as gwc
import groupdocs.watermark.options.pdf as gwo_pdf
load_options = gw.PdfLoadOptions()
with gw.Watermarker("document.pdf", load_options) as watermarker:
watermark = gww.TextWatermark("Do not copy", gww.Font("Arial", 8.0))
watermark.horizontal_alignment = gwc.HorizontalAlignment.CENTER
watermark.vertical_alignment = gwc.VerticalAlignment.CENTER
watermark.rotate_angle = 45
watermark.sizing_type = gww.SizingType.SCALE_TO_PARENT_DIMENSIONS
watermark.scale_factor = 1.0
watermark.opacity = 0.5
options = gwo_pdf.PdfArtifactWatermarkOptions()
options.page_index = 0
watermarker.add(watermark, options)
pdf_content = watermarker.get_content(gwc_pdf.PdfContent)
pdf_content.pages[0].rasterize(100, 100, gwc_pdf.PdfImageConversionFormat.PNG)
watermarker.save("document.pdf")
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