At present, there are two kinds of signature services in the market. One is to sign with a * * * certificate (* * certificate is an account used by many people);

Most smart phone systems need signature authentication of certificates to install and run application software. Programs without any signatures cannot be installed and run on smartphones.

The signature of enterprise account certificate is different from individual account and company account. Apps signed by enterprises can be directly used for internal download, installation and testing without review, but they can be downloaded directly through links or QR codes without being put on the appstore.

The demand for signature customers means that IPA applications that can't be placed on the AppStore of Apple (ios) can only be opened by using the signature distribution platform of Apple Enterprise P 12 certificate;

There are three types of Apple developer accounts: individual developer account ($99/year), company developer account ($99/year) and enterprise developer account ($299/year).

After signing, you can download the ipa package. Apple signature trust process: 1. After downloading, a prompt window of distrust will automatically pop up to trust in Settings-General-Device Management; 2. Click on the trust certificate and confirm the trust again after the pop-up window. At this time, you can run the APP.