"Kmsauto.net.2015.v1.3.9.portable.by.ratiborus" refers to a specific version of a well-known software activation tool. Here is the breakdown of what each part of that string signifies: KMSAuto Net
: Likely refers to the major release cycle or the year the core version of this specific engine was popularized. : The specific version number of the software. Kmsauto.net.2015.v1.3.9.portable.by.ratiborus