The relationship between client instances and end-users is not explained

[Denisthemalice]

Section 12.3 (Protection of Client Instance Key Material) states:

"Client instances are identified by their unique keys".

The rational for authentication client instances using a unique key is not explained.

An access token contains the rights or privileges of a human user and not those for a client instance.

The relationship between client instances and end-users is not explained.

[jricher]

The end user, when they are present, operates the client instance as enumerated in the definitions and discussed several times in many issues.

Closing as duplicate.