Script to remove author names from all annotations in a PDF.

remove_pdf_annotation_author.py

from pypdf import PdfReader, PdfWriter

reader = PdfReader('input.pdf')
writer = PdfWriter()

for page in reader.pages:
    if '/Annots' in page:
        for annot in page['/Annots']:
            obj = annot.get_object()
            if '/T' in obj:
              obj.pop('/T')

writer.append_pages_from_reader(reader)

with open('output.pdf', 'wb') as fp:
  writer.write(fp)