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This depends on whether it will be used as a physical print or a digital download.

Physical print: You do not need to give credit to GGBotNet, although I will appreciate it very much if you do.

Digital download: Must include the license statement somewhere in your documentation. For example, there are several ways to do this: You need to include the font license somewhere on the last page of the eBook, on the website, or in the readme file.