API Keys for several Enfold licences on several different websites

Hello,

we already asked these questions the guys on Envato Market/Codecanyon (where we purchased our Enfold Themes), but they answered they have no idea about such things and told us we have to contact the Theme creators.

We have the following questions:

We buyed several Enfold Themes (=licences) for several different websites and want to receive automatic Enfold-Updates.
We use one Enfold licence per website.

1) Do we have to generate a different API Key for each website that uses Enfold, or should we use the same API Key for all Enfold licences?
2) In case “Different API Key for each website”: Is it possible to somehow make remarks in our Envato Market/Codecanyon-Account next to all our generated API Keys concerning for which website which API Key we have taken? In order not to lose the overview whether the API Key is already taken or not and for which website.
Something like:
API Key 12wrer3485395gfgfg3 — mywebsite1.com
API Key 23erwe4890132ggfg4 — mywebsite2.com
etc.

We did a search also on forums, but the answers are contradictory. Some of support guys say: One API Key for all diferent Enfold licences, and other support guys say: no, you need an individual API Key for each Enfold licence.

So someone could clarify the situation?
This site http://kriesi.at/documentation/enfold/updating-your-theme-files/ tells unfortunatelly nothing about the case of several Enfold licences.

Best regards