The default and most common setting is &lt;b&gt;No&lt;/b&gt;.

Set this to &lt;b&gt;Yes&lt;/b&gt; if you are planning to sell things like GBs of data or maybe hours of development time. When the order is processed only one package will be created with the quantity ordered. 

Setting this to &lt;b&gt;No&lt;/b&gt; would create one unique package for each of the quantity ordered. For example, when an order is processed for a quantity of 10 licenses then 10 unique license keys will be created.