With the terms of our licence, you can use your purchased DC fonts stand alone to create a logo. As per our licensing terms though, you need to ensure that if you are creating for a customer, that you are providing them with a flattened end design, wherein they are unable to work with or extract the font in any way. This means that you cannot create editable templates or allow your customers to make changes to the logo themselves.
We would always recommend checking out our full licence here. However if you have any questions, please do contact us!