If you purchase the Media & Entertainment Collection online (via this page), you get a single-user Arnold license, which you can use on up to 5 separate machines. If you purchase a collection subscription from a reseller, you have the choice between receiving an Arnold single-user license or a 5-pack of Arnold multi-user licenses. The option to get multi-user licenses in place of a single-user license is only available if you buy from a reseller and doesn’t apply if you purchase online.