A method comprising: receiving, at data processing hardware, an audio-visual signal (217, 218) comprising audio data and image data, the audio data corresponding to speech utterances from a plurality of participants in a speech environment and the image data representing faces of the plurality of participants in the speech environment; receiving, at the data processing hardware, a privacy request from a participant of the plurality of participants, the privacy request indicating a privacy condition associated with the participant in the speech environment; segmenting, by the data processing hardware, the audio data into a plurality of segments; for each segment of the audio data: determining, by the data processing hardware, from among the plurality of participants, an identity of a speaker of a corresponding segment of the audio data based on the image data; determining, by the data processing hardware, whether the identity of the speaker of the corresponding segment comprises the participant associated with the privacy condition indicated by the received privacy request; and when the identity of the speaker of the corresponding segment comprises the participant, applying the privacy condition to the corresponding segment; and processing, by the data processing hardware, the plurality of segments of the audio data to determine a transcript for the audio data. receiving, at data processing hardware, an audio-visual signal (217, 218) comprising audio data and image data, the audio data corresponding to speech utterances from a plurality of participants in a speech environment and the image data representing faces of the plurality of participants in the speech environment; receiving, at the data processing hardware, a privacy request from a participant of the plurality of participants, the privacy request indicating a privacy condition associated with the participant in the speech environment; segmenting, by the data processing hardware, the audio data into a plurality of segments; for each segment of the audio data: determining, by the data processing hardware, from among the plurality of participants, an identity of a speaker of a corresponding segment of the audio data based on the image data; determining, by the data processing hardware, whether the identity of the speaker of the corresponding segment comprises the participant associated with the privacy condition indicated by the received privacy request; and when the identity of the speaker of the corresponding segment comprises the participant, applying the privacy condition to the corresponding segment; and determining, by the data processing hardware, from among the plurality of participants, an identity of a speaker of a corresponding segment of the audio data based on the image data; determining, by the data processing hardware, whether the identity of the speaker of the corresponding segment comprises the participant associated with the privacy condition indicated by the received privacy request; and when the identity of the speaker of the corresponding segment comprises the participant, applying the privacy condition to the corresponding segment; and processing, by the data processing hardware, the plurality of segments of the audio data to determine a transcript for the audio data.