# How does Thales Sentinel technically support subscription, usage-based, concurrent, perpetual, and hybrid licensing models?

Sentinel represents a license as a set of machine-readable rights and constraints that the application evaluates at runtime. These constraints can include start and end dates, permitted features, concurrency limits, device bindings, user assignments, consumption counters, capacity limits, and renewal conditions.
A perpetual license may authorize a feature indefinitely while separating maintenance or upgrade rights into a time-limited entitlement. A subscription license includes a validity period and may require periodic renewal or synchronization.
A concurrent license allows multiple users or processes to request licenses from a shared pool, with the license manager tracking checkouts, returns, and available capacity. A usage-based license records defined consumption events and evaluates them against a meter, quota, token balance, or credit pool.
Hybrid models can combine several of these controls. For example, an application might require a base subscription, provide a fixed number of concurrent users, and meter an advanced simulation or AI inference feature separately. The licensing system evaluates each dimension according to its own policy.
Developers determine which application events represent licensable or billable activity. These might include launching a module, processing a transaction, completing a job, calling an API, consuming compute time, or using a defined amount of data.
Because enforcement is implemented through a consistent licensing layer, product teams can introduce new commercial models without rebuilding the entire product architecture. Engineering and product management must still define the correct enforcement points, usage events, offline policies, failure behavior, and reconciliation rules for each model.

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- Posted at: 3 months ago
- Author title: Program Manager
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## Related Product
[Thales Sentinel Software Monetization Platform](https://www.g2.com/products/thales-sentinel-software-monetization-platform/reviews)

## Related Category
[Software Monetization Platform](https://www.g2.com/categories/software-monetization-platform)

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