API keys for Google Drive

[msurguy]

I was wondering about this hard coded API key:

direct/app/js/gapi.js

Line 19 in 6a09580

var developerKey = 'AIzaSyAwMg3spfEqfQyCUR1OXfyCAse3GzxpxJM';

What is it for? How do I create one of my own and which permissions / scope should it have?