Plugin is developed and delivered in freemium model.
License text is available in plugin configuration > About > License
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All features available before 500.x.y version will stay free and receive fixes and occasional updates. Features marked as paid are available upon purchasing license using Jetbrains Marketplace.
License is checked using APIs provided by Jetbrains Marketplace.
Result of last check is available in plugin configuration > About > Plugin Information
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Duration of license depends on type of your purchase made via Jetbrains Marketplace. Details on how each type of license available works are described in Marketplace Docs
Due to dynamic nature of some features (for example blame) it may be necessary to restart IDE after license purchase.