Yes, you are allowed to use our icons for a business logo, but you cannot trademark your logo if it uses one of our icons.
Our License Agreement prohibits patenting or registering trademarks, logos, and visual materials of all types, including our materials, either in full or in part.
As a free user, you will have to credit us everywhere you use a logo containing Lordicon materials. If you wish not to do so, you can simply switch to our paid plans. Paid subscriptions free you from the obligation to link Lordicon.