I want images from Stock to print and resell postcards. I've found some great images in AdobeStock. I understand I require Extended License in order to print and sale, I have these questions:
Am I allowed to modify the colors of the pictures acquired with extended license? I mean, I would like to print some of them in grayscale.
Am I allowed to put in a watermark in the picture? For example the code ISO 3166 of the country where the picture was taken?
I've read the policy but it doesn't state it clearly. Am I able to change an image into grayscale in order to print it as a postcard? Could I add some graphics to it?