https://techblog.jeppson.org/2018/12/generate-supermicro-ipmi-license/
https://peterkleissner.com/2018/05/27/reverse-engineering-supermicro-ipmi/
Anybody can create the license key on https://cryptii.com/pipes/QiZmdA by typing on the left side (select Bytes) the MAC address of the IPMI (the BMC), select in the middle HMAC and SHA-1, enter the secret key and on the right side the License Key will appear!