How to bulk watermark pdf files?

Question

PDF

Good day.
There are about 15 thousand pdf files, 5-10 pages each.
It is necessary to put a watermark in each file on each page.
It is not practical to do such a volume through online services, maybe there is some kind of desktop software that can handle this "in one go". Put it on for the night and let it draw.

Just a moment, the file names are approximately:
fxzejd1wvz6pw3j36dwl7fpwtgmh57qy5.pdf
hvoqhn4ih5g13sy44tcs80rlcwe0lwwdx.pdf
s7ef33orge4lqeom8qovasn5rh4fq6f7x.pdf
ag2v57tnqbytgxf3xlohpm0zqizlf8onz.pdf
q8v74y6lo61d1oy07ul7yift7o3x7xbz5.pdf
r01j326sdnf0xf19rim2njj71titgerl8.pdf

And they must remain unchanged.

Answer 1

https://stackoverflow.com/questions/12243044/is-it...