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Yep, that means that the VST dll coming from this v1.2.1 has the dongle authentification method coded inside it ! This is logical, if you want to install only RTAS, you'll need to use the dongle, and if you want to install both RTAS and VST (why not ?), everything will be done thru the USB key, you ...

If I understood everything well, it's because the v1.2.1 is the version with RTAS on it, its engine requires the dongle even if you choose not to install RTAS during the installation process ! KLC version with no RTAS is the one you can find under the "Authentication Method : Challenge & Response ...

Things are clear now, thanks Jerry.