Re: [w3ctag/design-reviews] Write up the Secure Stop issue for ddorwin (#73)

As requested, filling out the current issue template here:

**Title**: TAG review of EME "persistent-usage-record" session

**Summary**: Support a new MediaKeySessionType “persistent-usage-record session”, for which the license and key(s) are not persisted and for which a record of key usage is persisted when the keys available within the session are destroyed.

- Explainer¹ (minimally containing user needs and example code): https://github.com/xhwang-chromium/encrypted-media/blob/pur-session/persistent-usage-record-session-explainer.md

- Specification URL:
  * As in latest EME editors draft: https://w3c.github.io/encrypted-media/    
  * Diff against the current EME spec: https://github.com/w3c/encrypted-media/pull/462

- Tests: https://wpt.fyi/results/encrypted-media

- Security and Privacy self-review²: https://github.com/xhwang-chromium/encrypted-media/blob/pur-session/persistent-usage-record-session-tag-security-and-privacy.md

- GitHub repo: https://github.com/w3c/encrypted-media/

- Primary contacts (and their relationship to the specification):
  * Joey Parrish, @joeyparrish, [Google]
  * Greg Freedman, @gregwfreedman, [Netflix]
  * Xiaohan Wang, @xhwang-chromium, [Google]
  * Mark Watson, @mwatson2, [Netflix]
- Organization(s)/project(s) driving the specification: Google, Netflix
- Key pieces of existing multi-stakeholder review or discussion of this specification:
  * Previous TAG discussion: https://github.com/w3ctag/design-reviews/issues/73 
  * Previous W3C meeting discussion: https://www.w3.org/2019/07/02-me-minutes.html#item07

- External status/issue trackers for this specification (publicly visible, e.g. Chrome Status):
  * https://chromestatus.com/feature/5638708017496064


**Further details**:

  - [x] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)
  - The group where the work on this specification is currently being done: Media Working Group
  - Major unresolved issues with or opposition to this specification: None

We'd prefer the TAG provide feedback as (please delete all but the desired option):

  💬 leave review feedback as a **comment in this issue** and @-notify @xhwang-chromium 





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