/lib/udev/rules.d/75-cd-aliases-generator.rules is in udev 175-7.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | # These rules generate rules for the /dev/{cdrom,dvd,...} symlinks and
# write them to /etc/udev/rules.d/70-persistent-cd.rules.
ACTION=="add", SUBSYSTEM=="block", ENV{GENERATED}!="?*", ENV{ID_CDROM}=="?*", \
SUBSYSTEMS!="usb|ieee1394", \
PROGRAM="write_cd_rules", SYMLINK+="$result"
ACTION=="add", SUBSYSTEM=="block", ENV{GENERATED}!="?*", ENV{ID_CDROM}=="?*", \
SUBSYSTEMS=="usb|ieee1394", \
PROGRAM="write_cd_rules by-id", SYMLINK+="$result"
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