There are Googlers who could checkout the complete system, and I guess sell it online. There are pieces that aren't available to all Googlers, but the _large_ m

There are Googlers who could checkout the complete system, and I guess sell it online. There are pieces that aren't available to all Googlers, but the _large_ majority of the code is there, and browsable by everyone. Generally, you don't checkout all code you're using, just what you modify. You work in repos that exist virtually, because checkouts would be huge.