Last reviewed: October 2025

Dataflow and Storage

The Sentry platform is regarded from a GDPR perspective as a “Data Processor” and not a “Data Controller”. As such all data is processed within the client environment with no real time interaction, external access or data feedback into the Sentry system. The below will explain the technical specifics within a Milestone implementation.

The Sentry platform is fully integrated into the Milestone XProtect Video Management System (VMS), which allows Sentry to process video without the requirement to store video data, since all video data is managed by the Milestone VMS.

When video is required for display in the Client interface, for example when an Sentry alert has been generated, the VMS performs this function as per the standard VMS procedure.

On a high level, Video data is consumed from the VMS and alert data is pushed back into the VMS, with no data leaving this environment.

The diagram below provides a full overview of data processing and storage processes for the Milestone integrated Sentry system.

Video Storage

All video storage is managed by the Milestone VMS.

Data Storage

Sentry system data is jointly stored with the VMS data in a SQL server database.

Communications

All Sentry communications are based on Milestone standard internal communications mechanisms. This allows Sentry to use existing security and excrytption protocols as used by the VMS itself.

Sentry Unusual Behaviour and TREX Processing

Live video is consumed and processed directly from the Milestone VMS, and no private data is known to the system since only pixels and groups of pixels are identified and tracked throughout a scene.

Sentry Deep Learning (Object Classification)

The Sentry Deep Learning system classifies the source object type responsible for an Sentry alert through fully pre-learned neural networks. These networks are trained on generic and synthetic data, and do not contain any private data. Furthermore, no further learning takes place during production, and no learning feedback is available.

Sentry Rule Processing

The Sentry rule system aims to reduce alert volume by applying pre-configured logic to alerts. Alerts that pass rules checking will be displayed to operators for further analysis. It is the operator at the Control Centre who will finally determine if an unusual behaviour alert must be dismissed, alarmed as security threat or treated as another kind of alert that may require a different response mechanism, for instance medical attention (for example, call an ambulance)

Configuration

The Sentry configuration interfaces are embedded in the (VMS) Milestone Management Client Interface.

Operations

The Sentry alert interfaces are fully embedded in the Milestone Smart Client, leveraging the Milestone security and encryption technologies.

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