Questions about the usage conditions of Lip Sync.

I am considering whether to use "Oculus LipSync" for game development.
I want to ask some questions.


Q1.
Is it safe to use in games that are not submitted to the oculus store?


Q2.
I'm thinking about changing some c # sources.
Do I need to be notified of changes?


Q3.
Should I submit only the modified source?
Do I have to do all the source of the game?


Q4.
Is there a problem with selling games that incorporate "Oculus LipSync"?
Are there any usage restrictions?