What does the key displayed in the message at startup of the game in Steam mean?

[spillblood]

When I start the game in Steam, I get a message saying "This is your activation key for Teleglitch: Die More Edition. You will need to enter the key after the application has launched. Write the key down or press the copy to clipboard button now." I was anxious to close this because I didn't know what this key exactly does, the game doesn't ask for it after startup. Is it only for activation at paradoxplaza, or does it have some other function as well?

 

[unmerged(770820)]

It's only used to register here.

 

[spillblood]

OK, if there's a way to add info to the Steam overlay, please make that clear in Steam, there's no way to know it without going on the forums. A link to Paradoxplaza in the message would be nice.