How to protect audio from copying?

Question

Android

Good afternoon!
I want to develop a mobile application that will play audio files.
What are the approaches to protecting data from copying? Those. if the files are supplied with the application or downloaded from an external server, then they will physically be on the device and they will be able to pull them out of it.
What options do I see:
1) somehow encrypt / decrypt files
2) organize streaming (if the server option is selected)
Are there any other options?
Can you post material on the topic?