subscriptions-2.0.x-dev/subscriptions_content/subscriptions_content.permissions.yml

subscribe to all content types:
  title: Subscribe to all content types
  description: Subscribe to all content types, even unlisted and/or blocked content types.
  restrict access: TRUE

#subscribe to content:
#  title: Subscribe to content
#  description: Subscribe to individual nodes.

#subscribe to content types:
#  title: Subscribe to content types
#  description: Subscribe to content types.