The licence is straightforward, reasonable, and identical to most software licences. If you're purchasing a subscription to Sigma Science on behalf of a school or institution, then the resources may only be used within that school or institution for the duration of the subscription. If you're purchasing Sigma Science as a private individual (such as a teacher paying with their own money) then that individual may use them in the school(s) where they are employed for the duration of the subscription. Though Sigma Science resources are intended to be downloaded, you must not distribute them to other parties, for free or for payment, as this would constitute software piracy. Nor must you share your login details with other parties, even for preview purposes. This licence also applies to the free resources.