- This page is about the Palm OS handwriting system. See Graffiti for the wall markings.
 Graffiti 1 on Palm OS 4.1 Graffiti is the handwriting recognition software used in PDAs based on the Palm OS. Graffiti also runs on the Pocket PC, where it's called "Block Recognizer".
The software is based primarily on upper-case characters that can be drawn blindly with a stylus on a touch-sensitive panel. Since the user typically cannot see the character as it is being drawn, complexities have been removed from four of the most difficult letters. "A'" "F", "K" and "T" all are drawn without any need to match up a cross-stroke.
The Graffiti system has been the subject to a patent issue from Xerox, with its Unistrokes technology (US patent number 5,596,656, granted in 1997). Because of this, Palm was forced in court to reconsider its use of the original Graffiti system from a legal and technological standpoint, and discontinued the use of the Graffiti system as it stood in further versions of its Palm OS software and instead licensed a variant of the Jot system from CIC. The two systems are not identical, however Graffiti 2 recognizes some of the original keystrokes (except the input method for punctuation and "i", "k", "q", "t").
In 2004, a judge has ruled in favor of the defendant, saying about the Xerox patent that "prior art references anticipate and render obvious the claim".
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