Once upon a time it was all in one repository. Shortly after I started there in late 2005, the "HIP" source code (high-value intellectual property, I think it s

Once upon a time it was all in one repository. Shortly after I started there in late 2005, the "HIP" source code (high-value intellectual property, I think it stood for) was moved to its own source tree, with only precompiled binaries available to the rest of the company. Looks like there is a Quora question that mentions this too: https://www.quora.com/How-many-Google-employees-can-read-access-all-of-the-source-code-for-Googles-search-engine https://www.quora.com/How-many-Google-employees-can-read-acc...