This is determined by the umask of the user SDC runs as.
If the user uses umask of 022, new sdc.log files created will be owner writable and world readable.
You can verify the current umask by switching to the SDC user and running umask without arguments.
E.g. sudo -u sdc -i then umask
umask 22 would set the umask to 022 as described earlier.
For ways to make this change permanent we would recommend referring to the appropriate operating system documentation. Generally this can be done by modifying the profile for the user.
