/lib/udev/rules.d/98-osscuse.rules is in osspd 1.3.2-7+b1.
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 | # Allow everyone to use these devices
# /dev/cuse can stay mode 0660 root:root since osspd is run as root
# and drops privileges to user level when opened by user
KERNEL=="dsp", SUBSYSTEM=="cuse", MODE="0666"
KERNEL=="mixer", SUBSYSTEM=="cuse", MODE="0666"
KERNEL=="adsp", SUBSYSTEM=="cuse", MODE="0666"
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