Добавление водяного знака в PDF файл с помощью python

import PyPDF2

input_file = 'textPDF.pdf'

output_file = 'textPDF1.pdf'

watermark_file = 'logo.pdf'

with open(input_file, 'rb') as file_input:

pdf = PyPDF2.PdfFileReader(file_input)

with open(watermark_file, 'rb') as file_wotermark:

watermark = PyPDF2.PdfFileReader(file_wotermark)

first_page = pdf.getPage(0)

first_page_watermark = watermark.getPage(0)

first_page.mergePage(first_page_watermark)

pdf_writer = PyPDF2.PdfFileWriter()

pdf_writer.addPage(first_page)

with open(output_file, 'wb') as file_output:

pdf_writer.write(file_output)