is that legal when I purchased some HQ stock photo from site like photodune like tablet devices or iphone , and take it and convert it into “Product mockup ” to sold it into graphicriver
i think its not you should have Commercial use rights
If the stock image is on PhotoDune then you should have Extended license for it
You may license, sub-license, sell, resell or re-distribute the Work or offer to do any of these things (together referred to as Resale) in the following circumstances: the Work is incorporated into a larger work you have created; or if the Work is a template or software application, you use it alone to modify it and Resell it as an end product (that is, not as a tool, template, or stock item, and without source files); or you use the Work alone as a Limited Re-Purposing, but only if: (A) you first obtain the permission of the author of the Work; and ( the Resale of the second work is only made on an Envato marketplace. A Limited Re-Purposing means that you use the Work alone and modify it for Re-sale as a tool, template, or stock item, or with source files.