Canon VB-M40 Operation Manual page 76

View Restriction Setting Tool
View Restriction Setting Tool is a tool that limits the range that can be captured by the camera. If view restrictions have been
set, you can limit the displayable capture range using the viewer.
[Apply View Restriction Setting]
Restrictions set by the View Restriction Setting Tool are applied in the following cases.
• When the Admin Viewer is accessed with authorized user authorities
• When the VB Viewer is accessed
• When accessed via RM-Lite
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To limit zoom or a certain field of view when publishing live video, use
the View Restriction Setting Tool to set the view restrictions easily.