MDK6 editions - device support

We want to evaluate which edition (essential or professional) is required to build and debug operating system sources for ARM SecureCore (SC000 or SC300) based microcontrolers.

Here (Keil MDK) I found the follwoing:

Device Support  - Arm Legacy Cores (Arm7, Arm9, Cortex-R4, SecurCore)             

Essential: no

Professional: µVision only

What does it exactly mean, that the 'essential' edition does not support SecureCore? Is it not possible to compile secureCore architecture based code?

On this page (Arm Keil | Development Tools for IoT, ML, and Embedded) , ARM secureCore Device support is given for the 'professional' edition.

Could you clarify what is exactly meant (with device support)?

Thanks

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