Writing a digital signature on images

If you set the [Write Digital Signature] function to [On], you can write a digital signature on images. This information can be used to verify the authenticity of the images.

Before using the digital signature writing function, do the following in advance.

  • Create a key pair to be used for the digital signature using MENU → [Setup] → [Setup Option] → [Digital Signature] → [Key Settings] → [Create Key Pair].
  • Refer to “ Obtaining the server date and time ” and set the date and time.

  1. MENU → [Setup] → [Setup Option] → [Digital Signature] → desired setting.

Menu item details

Write Digital Signature:
Sets whether to write a digital signature on still images. (On/Off)
Write Digital Signature/ Write Digital Signature *:
Sets whether to write a digital signature on movies. (On/Off)

*The icons may differ depending on the model you are using.

Key Settings:
Configures settings related to the keys used for digital signatures. (Create Key Pair/Delete Key Pair)
Delete Signature Func.:
Deletes the license and related data for the digital signature function.

Hint

  • When [Write Digital Signature] is set to [On], (Digital Signature icon) and (Content Credentials icon) appear on the still image shooting screen. When [Write Digital Signature] or [Write Digital Signature] is set to [On], the icons appear on the movie shooting screen. If only (Digital Signature icon) is displayed, you cannot write a digital signature that complies with the C2PA standard on images. Import a certificate for C2PA compatibility and confirm that (Content Credentials icon) is displayed. Furthermore, for images shot in this state, (Digital Signature icon) and (Content Credentials icon) will appear on the playback screen. When executing the digital signature writing function, confirm that the icons are displayed. Similar icons are displayed in applications and services such as Creators’ App and Creators’ Cloud Web. Sig (Digital Signature) and C2PA (Content Credentials) are displayed on the shooting information panel () of Imaging Edge Desktop.
    Some display specifications may differ between when editing RAW and when editing JPEG.
  • If (warning icon) is displayed to the right of (Content Credentials icon), the certificate for C2PA may have expired. The certificate may be considered expired because the date and time in the camera are not set correctly. Set the correct date and time (user date and time) from MENU → [Setup] → [Area/Date] → [Area/Date/Time Setting]. If the correct date and time are already set, update the certificate for C2PA.
  • If the digital signature function for either still images or movies is enabled, and a digital signature is written to a movie, you can also write a digital signature to still images extracted from that movie using [Photo Capture].

Note

  • We cannot guarantee the verification results when images taken with Sony cameras are verified using other companies’ services.
  • You cannot write a digital signature on images in the following situations:
    • [Movie Rec During Streaming] is set to [Enable].
  • You cannot write a digital signature on the following images:
    • Slow-motion/quick-motion movies or time-lapse movies
    • 8K movies
    • Movies recorded in the MP4 format with a bit rate exceeding 222 Mbps
    • Externally output video
  • When [Write Digital Signature], [Write Digital Signature], or [Write Digital Signature] is set to [On], [Write Serial Number] is locked to [On].
  • The key pair is not deleted when [Camera Settings Reset] or [Initialize] under MENU → [Setup] → [Reset/Save Settings] → [Setting Reset] is performed.
  • When shooting with [Write Digital Signature], [Write Digital Signature], or [Write Digital Signature] set to [On], it takes longer to complete writing to the media than when shooting normally.
  • When you delete and recreate a key pair, if there are images that were signed using the previous key pair and you edit those images on the camera, the digital signature information will not be maintained.
  • When the digital signature function is enabled, [Soft Skin Effect] is not available.
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