I didn't write the "unofficial" part, but I can answer the questions: > Does it mean that people don't work on it full-time and it's a 20% project? That there

I didn't write the "unofficial" part, but I can answer the questions: > Does it mean that people don't work on it full-time and it's a 20% project? That there are a few of us paid full-time to work on this, plus some 20% contributors. > Does it mean that it was developed at home without using Google's resources, so they don't have an ownership interest in it, but they are letting it be hosted on their infrastructure and announced on their blog to be nice? No, this was developed by Google employees on Google's time. > Does it mean that Google isn't sure how long it will want to continue to contribute resources? I'm not sure what "Google" thinks about this, but I do know that the foreseeable future this is what I and my other teammates will be working on. > Does it mean that support is only available on an ad-hoc basis (isn't that the case with all free Google products)? There is definitely no support for Upspin beyond us and the community helping people on the mailing list. > Does it mean that serious customers shouldn't rely on it to work reliably? As is stated in the README, Upspin is still very rough. It's early days. > Does it not really mean anything, and just thrown on there for legal protection (against what?)? I'm not sure what "unofficial" means in this case but I hope I have answered your questions sufficiently.