Adobe Lightroom's built-in watermarking tools not good enough. Why I don't make it yourself?
$ exifstamp -h
usage: exifstamp [-h] [-s NO_STRIP_EXIF] [-t THEME] [-o OUTPUT] [-n] [-e EVENT_NAME] [--debug] INPUT [INPUT ...]
strip and stamp a watermark with EXIF data from images
positional arguments:
INPUT path(s) to file(s) to watermark/scrub on
options:
-h, --help show this help message and exit
-s NO_STRIP_EXIF, --no-strip NO_STRIP_EXIF
do not strip EXIF data from images. default is False
-t THEME, --theme THEME
watermark theme, default is talk-with-kana
-o OUTPUT, --output OUTPUT
set output directory. Defaults to "./output" or input directory with prefix "_stamped"
-n, --no-watermark do not put watermark on images. default is False
-e EVENT_NAME, --event-name EVENT_NAME
Watermark Heading 1
--debug print helpful debugging information