This wall scroll is discounted because of a very minor paper flaw.

Kempo Karate

Law of the Fist Empty Hand

The first two characters mean "karate" - technically they express "empty hand".

The last two express "fist law" which is Romanized from Japanese as "Kenpo" or "Kempo".

That "empty hand" translation can be understood better when you grasp the idea that karate is a martial art without weapons (other than the weapons organic to your body, such as your foot, hand, fist, etc). When you practice karate, you do so with empty hands (no weapons).