When adding an MP3 file as a rich media to a manuscript chapter, the default HTML5 audio element has the option to let a user download the file and listen to it offline. I offer downloadable files of my narrated stories to supporters, so this would allow a curious reader to subvert that and get a story for free.
Preventing downloads is as simple as adding this tag to the enclosing <audio> element:
controlsList="nodownload"
An option could be provided during chapter creation and setup that would add or omit this tag as the author wished.
An example of the tag in action can be seen at the version of the story I have posted on my own site, at the first audio element:
https://dispatch.zmthomas.com/p/the-dragonfruit-express
This would help authors and creators who want to protect their content and only allow streaming/online listening, or who want to offer higher-quality audio for download. Thank you!