Discuss minimal block reason handling

[defagos]

As a legal team member I want blocked content not to be playable with Pillarbox.

Acceptance criteria

The following strategy has been discussed with the team:

• Add to packaging requirements that blocked content must be removed from streams entirely.
• Have Pillarbox check segments and return a block reason error if one of the segments is blocked (likely return the 1st encountered block reason).

Rationales:

• Blocked reasons are the exception, not the rule, and affect old content essentially.
• Blocked content must be removed from streams since unprotected streams can be dumped.

Tasks

• [x] Discuss.
• [x] Document decisions and create derived tasks if needed.

[defagos]

As discussed with the team:

• Minimal handling makes sense.
• Geoblocking and age-based blocking might not be addressed in an optimal way with this strategy (blocking is dynamic, unlike unpublished sequences). The solution outlined above will likely have to be discussed with product teams first.
• We will at least implement minimal blocking during this sprint to be compliant with legal rules. If there are further needs they will emerge later anyway.