What rights do I grant/transfer to the buyer(s)?

As The Author you agree to transfer the related rights to The Buyer(s) when they acquire the Item(s).

When The Buyer aсquire a Full License, you agree to transfer a full rights of the Item(s) to The Buyer. After a Full License will be aсquired, the Item will be automatically removed from the ProducerBox Marketplace and you will not be able to sell/upload it again until you will purchase a Full License from the new owner of the Item(s).