(DOnT) Off-chain Non-Transferability

## Overview

As an (part)owner of a digital asset, I want to ensure that my asset can't be accessed by an unauthorized user, so that the value of the asset stays high.

### Reference

- [Media Chain](http://www.mediachain.io/)

### Questions

- How do we enforce unauthorized users?
- Do we use cryptography?
- Stenography
- User puts up collateral (private key, or eth in escrow)
- Can we use streaming somehow?
- Are there other things out there that we can use?
- mediachain.io
- What experiments could we run?
- What can we build to show our DRM pattern off?
- What options exist both on and off chain?

### Assumptions

- We need some kind of DRM to maintain value of the bootleg token
- Our DRM pattern should not be tightly coupled to #5 the ERC, but it should inform it
- Time permitting, given interest and result of the research, we should build something.

### Acceptance

- Documentation for pattern implementation
- Architecture diagrams and descriptions
- POC - working implementation of encryption, decryption, and secret sharing
- Encryptor lib, decryptor lib, a smart contract
- Works with #5 (Runs inside the simulation/example)
- ~Run at: Medium article explaining how we might do DRM with blockchain~

## Stories Draft

- [ ] Research what already exists for DRM in the blockchain space
- [ ] Write up an article

The issue names no files, tests, or entry points; start by reviewing the linked Media Chain reference and researching existing blockchain DRM approaches. Done means documenting a DRM pattern with architecture diagrams and descriptions, plus a working encryption, decryption, secret-sharing, and smart-contract proof of concept that runs in the simulation/example.

Written by the indexing model from the issue text.