Azure Speech

At a glance

Video

Content CredentialsA signed record (C2PA) of how the file was made, sealed so any change shows.

Microsoft says Azure text to speech avatar adds a signed C2PA manifest, with softwareAgent.name "Azure Speech", to avatar videos; this is supported only for batch-synthesis MP4 files.

Content credentials in Azure text to speech avatar – Foundry ToolsMicrosoft (Microsoft Learn)

Quoted passage What are content credentials?; Limitations

Azure text to speech avatar adds a content credentials manifest to each avatar video, giving you information about the video's origin. A cryptographic signature secures the manifest, linking it back to Azure text to speech avatar. […] This field has a value of Azure Speech , identifying the software that created the video. […] The content credentials are only supported in video files generated by batch synthesis of text to speech avatar, and only mp4 file format is supported.

Invisible watermarkA signal woven into the pixels, frames, audio or wording, meant to survive copying.

Microsoft says Azure Speech text to speech avatar outputs are automatically watermarked.

Microsoft does not name the watermark or say whether it is visible.

Text to speech transparency note – Foundry ToolsMicrosoft (Microsoft Learn)

Quoted passage Text to speech avatar

In addition, avatar outputs are automatically watermarked. Watermarks allow approved users to identify whether a video is synthesized using the avatar feature of Azure Speech.

AI label in metadataA plain metadata field (IPTC Digital Source Type) saying AI made the content. Anyone can add or remove it.

Not stated. None of Microsoft's pages listed under Sources read says so.

Visible markA mark you can see, such as a logo or a sparkle in a corner.

Not stated. None of Microsoft's pages listed under Sources read says so.

Tool named in metadataThe tool or model written into ordinary file fields, such as Software or Creator.

Microsoft says the C2PA manifest on avatar videos carries softwareAgent.name "Azure Speech".

Content credentials in Azure text to speech avatar – Foundry ToolsMicrosoft (Microsoft Learn)

Quoted passage What are content credentials?; Limitations

Azure text to speech avatar adds a content credentials manifest to each avatar video, giving you information about the video's origin. A cryptographic signature secures the manifest, linking it back to Azure text to speech avatar. […] This field has a value of Azure Speech , identifying the software that created the video. […] The content credentials are only supported in video files generated by batch synthesis of text to speech avatar, and only mp4 file format is supported.

Audio

Content CredentialsA signed record (C2PA) of how the file was made, sealed so any change shows.

Not stated. None of Microsoft's pages listed under Sources read says so.

Invisible watermarkA signal woven into the pixels, frames, audio or wording, meant to survive copying.

Microsoft says watermarks are added to custom neural voices created with Azure Speech personal voice, identifying the synthesis and the voice used.

Microsoft does not name the watermark.

Text to speech transparency note – Foundry ToolsMicrosoft (Microsoft Learn)

Quoted passage Personal voice (section on text to speech features)

Watermarks are added to custom neural voices created with the personal voice feature. Watermarks allow users to identify whether speech is synthesized using Azure Speech, and specifically, which voice was used. Eligible customers can use Azure Speech watermark detection capabilities.

AI label in metadataA plain metadata field (IPTC Digital Source Type) saying AI made the content. Anyone can add or remove it.

Not stated. None of Microsoft's pages listed under Sources read says so.

Visible markA mark you can see, such as a logo or a sparkle in a corner.

Not stated. None of Microsoft's pages listed under Sources read says so.

Tool named in metadataThe tool or model written into ordinary file fields, such as Software or Creator.

Not stated. None of Microsoft's pages listed under Sources read says so.

Limits and detection

Checking tool from the makerA way the maker offers to check a file for its traces.

Microsoft says eligible customers can use watermark detection for personal voice, and approved users can detect avatar watermarks.

Text to speech transparency note – Foundry ToolsMicrosoft (Microsoft Learn)

Quoted passage Personal voice (section on text to speech features)

Watermarks are added to custom neural voices created with the personal voice feature. Watermarks allow users to identify whether speech is synthesized using Azure Speech, and specifically, which voice was used. Eligible customers can use Azure Speech watermark detection capabilities.

Text to speech transparency note – Foundry ToolsMicrosoft (Microsoft Learn)

Quoted passage Text to speech avatar

In addition, avatar outputs are automatically watermarked. Watermarks allow approved users to identify whether a video is synthesized using the avatar feature of Azure Speech.

What the maker says about limitsIn the maker's own words.

Microsoft says Content Credentials on text to speech avatar videos are supported only for batch-synthesis MP4 files.

Content credentials in Azure text to speech avatar – Foundry ToolsMicrosoft (Microsoft Learn)

Quoted passage What are content credentials?; Limitations

Azure text to speech avatar adds a content credentials manifest to each avatar video, giving you information about the video's origin. A cryptographic signature secures the manifest, linking it back to Azure text to speech avatar. […] This field has a value of Azure Speech , identifying the software that created the video. […] The content credentials are only supported in video files generated by batch synthesis of text to speech avatar, and only mp4 file format is supported.