/lib/udev/rules.d/51-dlm.rules is in dlm-controld 4.0.7-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | KERNEL=="dlm-control", MODE="0666", SYMLINK+="misc/dlm-control"
KERNEL=="dlm-monitor", MODE="0666", SYMLINK+="misc/dlm-monitor"
KERNEL=="dlm_plock", MODE="0666", SYMLINK+="misc/dlm_plock"
KERNEL=="dlm_*", MODE="0660", SYMLINK+="misc/%k"
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