Subscribing to Ardour means making a small monthly payment that helps to support the continued development of the program. It does not affect your "ownership" of the software, the way that some other "subscription-based" systems do.
We currently have 4 different subscription plans: $1, $4, $10 or $50 per month (all in US dollars). All subscriptions will run until cancelled. The $50 plan exists primarily for institutions that want to support Ardour.
Our subscriptions are managed by PayPal. If this is a problem for you, or you wonder why we use PayPal, or have other questions about subscriptions, please read this.
Your monthly payment will be retried once if it fails. Visit PayPal to manage your subscription, cancel or renew it, etc.