Collection sets
Timeline sets (or collection sets) allow you to deliver different content to different users, based solely on user choice.
You can assign certain timelines or editions to a set, and if so only users who have chosen that set, will see that timeline in the app. Users make this choice at first launch on a screen that shows before or amongst the original app onboarding screens, but it can also be included as an option in settings.
You can assign more than one set to a timeline, and any timeline or edition not specifically assigned to a set will be visible to all users.
A common use case for using sets is when you have readers in different regions. New Statesman, for example, have a UK edition and an International edition. They deliver both sets to the app, but users will only see the one they opt in to.
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Sets could also be used for language localisation, or any other way you may have to split your content.
NB - Timeline sets have no connection to your app's authentication. All users have the ability to see all sets regardless of their access.