Windows CdRom device arbiter service
Windows CdRom device arbiter service (WinCdArb) ia small service that enables direct access to optical disc drive for all applications, even ones running without Administrator privileges. Normally Windows restricts access to all SCSI devices (which include all optical disc drives) only to applications that are run as Administrator. WinCdArb loosens this restriction, enabling access for everyone to optical drives but keeping the default policy for all other SCSI devices.
WinCdArb is a very small service (few kilobytes of code) - to make sure the security impact is minimal. It is much safer to run as administrator a dedicated and secure service rather than a huge application like MakeMKV, or even a kernel-mode device driver like other applications do.
The service is open-source, released under GNU GPL license. The source code can be downloaded here.