/usr/share/cups/ppd-updaters/printer-driver-pxljr.ppd-updater is in printer-driver-pxljr 1.3+repack0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | DRIVER_REGEXP='^pxljr:'
GENNICKNAME_REGEXP=
|