When you have completed your purchase of the Fotosizer Professional edition, you will receive your product license key on the completion page, along with a link to download Fotosizer. You will also receive a confirmation email with the same details and another email receipt of your purchase.
When you buy any of the variations of Fotosizer Professional, you receive a "lifetime license". This means that you will be eligible to receive any updates or future new versions completely free without needing to buy the product again.
When you buy any of the variations of Fotosizer Professional that allows to be installed on more than 1 computer, you will receive a single product key to activate each computer installation. You will be able to install using the same product key on as many computers as the license allows.
Quite often, eBay and other online auction site listings will contain photos of the product(s) being sold. Fotosizer allows you to resize your product photos so that you can then display them more easily and quickly on your auction listing.