If you subscribe the online stock photography company than you are allow downloading the images, as you want. Based on the requirements from the customers like publishing houses, add agencies and other users. The requirement gets changes according to the use. Some people wants art print while some other wants JPEG image form directly download it from the online website. Once you sign the agreement to get the image license you are allow for use of publications while the art prints are use for display only. It can't be reproduce again.
Once you download the images from the online store by credit card as per agreement form available online. You must be adhered to get the terms of the agreement. Some time many agents get the license and get the reproduction of the end-user. If you want to further sell the images than you must pay additional fees. It is known as approved Photo or image
You must have to purchase each image and by each end-user and your licenses must be transferable. The end-users must be responsible for protection of property of the images and images are not used as logo or brand of the company. You are not allowing you to resell the images purchased by you in any form.
You must abide the rules of the company so that you do not get into trouble.
