Definitions with .n2d extension are non-sharable?

Hi!
The definitions with .n2d extension are non-sharable?
I mean i have to buy them in order to be able to use them?

N2d definitions generally are distributed as part of coaching packs and are tied to a specific user license. For that reason they are not shareable. If this is not what's happening please clarify

In some way i realized that 2 months ago when i made the question.
Thanks anyway.