Guitar Notes Master for Android does not directly collect any personally identifiable data such as e-mail address, phone number etc. However, it does include a number of 3rd party services that may collect data and these are detailed below:
Guitar Notes Master for Android uses Google Analytics to track how the app is used so that we can better learn how the app is used in order to improve it in future updates.
You can find out more about how Google Analytics stores your data here: https://support.google.com/analytics/answer/6004245?hl=en
Should you wish to, you can opt out of data analytics collection by unchecking relevant option in the settings screen.
Guitar Notes Master for Android includes adverts served by AdMob, which is part of Google.
Ad networks are companies that manage the advertising process on this and many other apps. For that reason, they may know information about you based on the way you use all the apps where they provide advertising services. They compile this information to paint a picture of which types of adverts you are likely to be interested in.
Google may use the device ID from where the ad is serving to generate interest and demographic categories (for example 'sports enthusiasts' or 'inferred age: 18-34'). These interest and demographic categories will be used to serve ads better targeted to the user.
Guitar Notes Master allows you to purchase lesson content. We will never have access to sensitive billing information such as credit card or bank account details, even though you're paying for items via the app. Payments are processed by Google Wallet