The art was adapted and derived from a number of open sources and made possible by a lot of nice people’s willingness to share. Thank you all. The cover contains images adapted from stock photos from Marcus J. Ranum and photos from the public domain. Our blood splatter is based on one CC BY Sacks08.
Fonts used include Dimbo (CC BY SA 3.0 GrandChaos9000), F25 Executive, Adobe Garamond Pro, and Courier New.