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Features released: ECS instance identifier helps you quickly confirm whether the application runs on an "Alibaba Cloud ECS" and hence provides an important basis for application permission control and software activation.  It is applicable to the following use cases:  1) The customer needs to migrate its traditional commercial applications to Alibaba Cloud Marketplace. 2) The customer wants a secure and trusted identification mechanism to determine whether the current application actually runs on Alibaba Cloud ECS servers out of data security concerns. PKCS#7 signature algorithm is a secure encryption signature algorithm of the business standard, ensuring the signature mechanism security. The custom audience feature provided by the instance identifier is a pioneering and leading security mechanism industrywide. It greatly guarantees the signature mechanism security and protects signatures from unauthorized use. Target customers: ecosystem partners, ISV partners on the Alibaba Cloud Marketplace, and the finance industry