California Proof Of Service PC 1203.4 is a legal document that is used to prove that a particular court document was served upon a person or entity. It is issued by the California Superior Court and must be signed by the person or entity to whom the court document was served. There are two types of California Proof Of Service PC 1203.4: Personal Service and Substantial Compliance. Personal Service is proof that the court document was personally served upon the recipient, while Substantial Compliance is proof that the court document was served in a manner that is substantially equivalent to personal service. The document includes the date, time, and place of service as well as the name of the person or entity to whom the documents were served and who served the documents.