I would like to know if once buying the copyright removal key, and changing the configuration settings, will it remove the Poweredby Nopcommerce from all areas. Does it remove it from the cart and the Admin area. I need it removed from all areas to include the administration area. The cart will be used by my customers and they will have administrative access. We are going to host and manage many aspects of the cart but they will manage their one sales and clients.
After buying the key, you can remove ( or hide) it from nopCommerce including admin area. And, You have to manually remove it. Please have a look at \Modules\Footer.ascx file for versions 1.X, or \Views\Shared\Footer.cshtml file for versions 2.00-2.50, or \Views\Common\Footer.cshtml file for further versions. And starting version 3.70 you can remove it by going to admin area > configuration > settings > all settings > set 'storeinformationsettings.hidepoweredbynopCommerce' to 'true'.