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In this tutorial, we will learn how to add a Watermark to a PDF file. We use a PDF writer object to create a new PDF file and a PDF reader to read an existing file. By looping through each page, we add the content to the writer. The final step is to write the data to an output PDF file. The code simply copies each page from the existing file to create a new one. The input files are a Watermark PDF file and another PDF file. We read the Watermark PDF file and merge its content with the existing file's content to create the final output.
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