Active content consists of targets (machines, challenges, etc.) that are in the current leaderboard rotation, meaning that players can solve this content for points on the leaderboard and rank progression. Retired content consists of older targets that do not offer points upon completion anymore, but have readily available professionally-written Write-ups and tutorials for players to study during their attack on the targets.

VIP+ offers players instances that have DHCP IP addresses, which isolate them from the rest. VIP subscriptions only offer more servers with less players on each one, lowering the chances for two players to compete on the same instance.

Since personal instances can still be found through a simple sweep scan, the answer is no. Make sure you secure your personal VM environments before working on any type of content. Alternatively, you can use Pwnbox, which completely eliminates any threats from other players as long as you don't save your personal information on it.

Yes, you can buy vouchers for VIP/VIP+ and use them at any time as long as you don't have an already active subscription. Once a used voucher subscription period reaches its' end, you will have to wait for it to expire before you can use another voucher, as voucher subscriptions do not stack up.

For now, there is only automatic payment. Once your payment details are registered into Recurly for our services, Recurly will take monthly / yearly payments (depending on your subscription type) automatically every billing cycle. However, cancellation is easy to do in case you want to pass on a few months. You can cancel your subscription anytime by visiting Profile/Subscriptions.