Counterfeiting currency or legal tender; Presenting a fake or altered check or other financial document. Counterfeiting or forging the handwriting or seal of another person is a forgery.Maybe, there are many types of forgery. It's simply described as knowingly filing a forged or false document with a California government office. Under the Penal Code 470 PC, the California State Law defines forgery as deliberately engaging in unlawful activities to commit fraud. § 471 defines forgery as altering, making, or possessing false material or documents with the intent to commit fraud. In California, forgery is charged under penal code 470 pc. Forgery does not necessarily require that you personally signed or altered the document, it is enough to pass or use a forged document if you know it is forged.