I’m confused

If a particular book is only available as an ebook, how is the included CD delivered?

While browsing the available books for purchase I found the CompTIA Security+ Deluxe Study Guide Recommended Courseware, 2nd Edition at

The description shows Also on the CD, you'll find extra exercises and study tools, training software, videos, a special appendix on cabling, a useful list of acronyms, and more.

Yet the book is only available for purchase in Ebook format. How is the CD content delivered if this is only in ebook format?
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