The decision tree needs to be uploaded in the sensor at every turn-on cycle from MCU side. This means that, if somebody can sniff the communication bus, can also get in possession of the required register writings to implement the decision tree. Also, the decision tree is uploaded in the sensor RAM without any encryption and can theoretically be downloaded. However, it can be from tricky to impossible to somebody that gets in possession of the RAM content/register writings to adapt the decision tree to its application, since ST does not provide any information on how to interpret the register/RAM content.
