Silent Light doesn't collect any user identifiable information on its users, ever.
We do collect anonymous information on how many of our users use which types of devices to help us make Silent Light better. All we see from this information is a table with information such as what percentage of Silent Light users use iPads, or iPhones, or iPod touches.
If Silent Light ever crashes (sorry!) anonymous crash reports may be sent to us. There's no way we can tell who you are, where you are or anything that could identify you. It's totally anonymous and we only use it to fix bugs.