#summary: A contract to sell a regular update of a small (max 8kb) piece of information for n periods to an audience of at most m subscribers.
#requirements:
- The publisher must deliver the updates to receive payment.
- The information must be encrypted in transit.
- It must not be possible for a non-subscriber to access the information.
- Contracts must be transferable after creation.
- Subscribers must be able to transfer their interest in the update stream; an act which must prevent the seller from accessing the updates once the contract has been sold.
- All of the subscribers must be able to access their updates simultaneously.