In the products catalog at Master-Resale-Rights.com, you may notice inside the product descriptions (especially in the "PLR" or "Private Label Rights" section. This is an indicator that you are indeed getting the products fully editable source like the eBook in MS Word format, or a video in .AVI format.

These can be edited with your own information if you have the required editing software to do so.

See below where you will see the "(source)" indication.