Buy a licence someone no longer needs, or sell yours on. You resell the licence itself, not a copy: nothing to upload. Your payment waits in escrow while the publisher seals the licence to your computer, phone or browser, and the seller is paid only once your Pramaan has checked it works there. The seller's copy stops working.
Reading the record…
Press Show my licences. Pramaan asks you to share your wallet's address with this page; nothing is paid.