For the MOBOTIX Plug Ins a Milestone User need to purchase MOBOTIX License via Sales@mobotix.com.
https://community.mobotix.com/t/mobotix-plug-in-s-license-to-support-milestone-xprotect/6925
After Installing the MOBOTIX Plug In package to the Milestone XProtect in the left Side Navigation of the VMS, there will be a the category “MOBOTIX Licensing”. In this Dialog the User can activate his MOBOTIX Plug In Licenses and get a overview of the activated Licenses
Each MOBOTIX Function shows the uses licenses in detail: