The clients don't want us mucking around in their code, which is why they have their devs do the work. There are some cases where having a dev on our end could help unblock their devs, but these are pretty rare cases. In general, it's very easy for folks to use our tech, and I'm able (thanks to a couple years of CS back in the day) to help out with the vast majority of questions that come up.

In terms of changes, there aren't any material changes. We've had licensees up and running for 7 years without changing any code.