When using custom fonts in Career Site Builder, you must ensure that the customer has the legal right to use the font on their career site. This means that the customer must own the font license or have permission from the font owner. Uploading a custom font without a license may result in legal issues or penalties for the customer. Therefore, it is important to verify the font license before uploading it in Career Site Builder. Reference: SAP SuccessFactors Recruiting: Candidate Experience Administration, Unit 4: Career Site Builder Global Settings and Global Styles, Lesson: Configuring Fonts, Slide 6.