Are you wondering why the cloud license cannot be opened? The cloud license cannot be opened because the system is being upgraded. While the system is being upgraded, all customer information is in a frozen state, so it cannot be opened. It can be opened after the upgrade is completed. Cloud license, also known as aircraft pilot electronic license, refers to the electronic version of the aircraft pilot license with a digital signature. This version is based on computer cloud digital information and is produced, issued and published by the flight standards functional department of the Civil Aviation Administration of China. Aircraft pilot registration and endorsement information is available.