Security foil is a holographic foil square placed at the bottom-right of almost all Yu-Gi-Oh! Official Card Game and Trading Card Game cards from Series 2 onward. It contains a hologram with the Eye of Anubis logo and the word "Yu-Gi-Oh!"
All officially released TCG and OCG cards, except Series 1 cards (which were only released in the OCG) and the Duelin' Monsters Giveaway promotional card, have the security foil. Cards sent to stores for demonstration purposes rather than public distribution (such as the Demo Speed Dueling kit) do not always include the foil, as counterfeit protection is unnecessary for cards that are not intended to be in circulation. Official Proxy images of cards do not accurately reproduce the foil, either excluding it entirely or replacing it with a solid-colored square.
Security foil consists of a solid-colored background, on which rows of Eyes of Anubis and the text "YU-GI-OH!" are printed in holographic lettering. However, starting around 2017 with the debut of the Code of the Duelist booster pack (August 4, 2017), very small holographic stars are also evenly interspersed across the hologram. The Eyes and the text are visible from a range of lighting and viewing angles, but the stars are only visible from very specific angles.
The foil is printed directly on the card; contrary to its appearance, it is not a sticker. The foil is so thin that it should not be possible to feel by running a finger over it — this is often not the case for counterfeit cards.
The foil has a different color depending on the card's edition. Limited Edition and 1st Edition cards have a gold foil; Unlimited Edition cards and all Japanese and Chinese OCG cards have a silver foil. In the TCG, the Ticket Cards have a gold foil despite not having a listed edition, even when printed in Unlimited Edition sets.
- "New to Yu-Gi-Oh!". Yu-Gi-Oh! TRADING CARD GAME. Konami. Retrieved 28 October 2021.
The security foil on First Edition (or first printing) and Limited Edition cards is gold, while the security foil on Unlimited Edition cards (when products are printed again) is silver.
- "UDE Tournament Appendix: Appendix A: Yu-Gi-Oh! TCG Policies" (PDF). Upper Deck Entertainment.