Official documentation
Speech service encryption of data at rest
Microsoft, Microsoft Learn, 2026
Read the originalRead on October 17, 2026
- What it is
- Microsoft's page on how Azure AI Speech stores data at rest, including custom speech and custom voice training data, and a statement on whether customer data is used to improve its Speech models.
- How much weight it carries
- Official Azure documentation. The page covers the custom speech and custom voice features in detail, so its storage statements apply most directly to those features. Terms can change, so check the live page.
Facts taken from this source
- For custom speech and custom voice, Microsoft says your uploaded data is stored in Microsoft's storage by default, unless you prepare your own storage account.
“By default, your data is stored in Microsoft's storage and your Speech resource uses Microsoft-managed encryption keys.” (Custom speech and custom voice, storage)
- Microsoft says that if endpoint logging is disabled and no customizations are used, no customer data is stored by the Speech service.
“if endpoint logging is disabled and no customizations are used, then no customer data is stored” (Custom speech and custom voice, Important note)
- Microsoft says it does not use customer data to improve its Speech models.
“Microsoft does not use customer data to improve its Speech models.” (Custom speech and custom voice, Important note)