One software license is required per developer.
Runtime Royalty Free.

Yearly/Annual license: Renewable upon expiry after 1 year. Applies to all plans except the Enterprise plans.
One-off: Perpetual License, buy the license once. No renewal required. Available only for Enterprise plans
Updates - Available for free for all plans during the active license period.
Premium support - Support is available on live chat and on email and if required, remote support.