Artifacts from the family of Col. Harland Sanders contained fried chicken recipes, but KFC has insisted the one with the correct 11 herbs and spices is kept secure in its headquarters.

KFC claims that Church's use of the phrase "original recipe" in its own advertisements "is likely to create confusion in the marketplace.

Church's Chicken has recently begun advertising some new chicken, bragging about the fact that they've gone back to the "original recipe." This is famously what KFC calls its fried chicken, in reference to Harland Sanders' original recipe.

The San Antonio-born brand has been celebrating the return of its "legendary original recipe" in recent marketing.

In a lawsuit filed Nov. 8 in the U.S. District Court for the Eastern District of Texas, KFC has accused fellow fast-food fried chicken purveyor Church's Texas Chicken of violating its trademark rights by using the phrase "Original Recipe" in its advertisements and promotions.

KFC has sued Church's Texas Chicken, accusing the rival fast-food chain of violating its trademark rights in the phrase "Original Recipe."