A Certificate of Service- To Some CM/ECF Case Participants is a document used in civil court proceedings to certify that a pleading or other document has been served to the parties involved. It is typically signed by the server, or a person authorized by the server, and filed with the court. It serves as proof of service, indicating that the opposing party has been served with the pleading or other document. There are two types of Certificate of Service- To Some CM/ECF Case Participants: a Certificate of Service to All Parties, and a Certificate of Service to Some CM/ECF Case Participants. The Certificate of Service to All Parties certifies that all the parties in the case have been served with the pleading or other document. The Certificate of Service to Some CM/ECF Case Participants certifies that only certain CM/ECF case participants have been served with the pleading or other document.