"Encrypted 0.2" firmware for SiK HM-TRP

I noticed that the Japan Specified Radio Test Report for the Holybro SiK Telemetry Radio V3 mentions the following firmware version: “Encrypted 0.2 SiK 2.0 on HM-TRP” and I vaguely remember once seeing the same version on an mRobotics Telemetry Radio V2.

What exactly does the “Encrypted 0.2” refer to? Other than that I’ve only ever seen “SiK 2.0 on HM-TRP”, etc.
Searching for the exact string (Encrypted 0.2) regarding SiK yielded no results besides the mentioned test report.

I suspect that it might be regular firmware with local restrictions implemented but encrypted to prevent installation of regular or modified firmware that was not tested by japanese authorities.

It likely was intended to comply with local regulations.