AI-generated Key Takeaways
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          The Display & Video 360 API v2 has been retired. 
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          The document outlines various possible digital content label rating tiers. 
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          Content rating tiers range from unrated to suitable for mature audiences. 
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          Some rating tiers, like CONTENT_RATING_TIER_FAMILIES, have specific applicability to certain line items.
Possible digital content label rating tiers.
| Enums | |
|---|---|
| CONTENT_RATING_TIER_UNSPECIFIED | Content label is not specified in this version. This enum is a place holder for a default value and does not represent a real content rating. | 
| CONTENT_RATING_TIER_UNRATED | Content that has not been labeled. | 
| CONTENT_RATING_TIER_GENERAL | Content suitable for general audiences. | 
| CONTENT_RATING_TIER_PARENTAL_GUIDANCE | Content suitable for most audiences with parental guidance. | 
| CONTENT_RATING_TIER_TEENS | Content suitable for teen and older audiences. | 
| CONTENT_RATING_TIER_MATURE | Content suitable only for mature audiences. | 
| CONTENT_RATING_TIER_FAMILIES | Content suitable for family audiences. It is a subset of CONTENT_RATING_TIER_GENERAL. Only applicable to YouTube and Partners line items. |