The legal entity these documents are licensed to. The name appears in the document footer, standard file metadata (Author / Company / Description) and custom properties. The license is non-transferable — to use the documents for any other entity, a separate license must be purchased in that entity's name.
Without this, you can download the version you bought (v1) for 3 months from purchase. With the subscription, you also get any new versions released in the next 12 months — and the download window for v1 stays open throughout the subscription.