Platform-as-a-Service: BPM BlueWorks runs on a middleware platform that includes application servers, database servers, collaboration servers, and security servers.

平台即服务(Platform - as - a - Service)： BPM BlueWorks运行在一个包含应用服务器、数据库服务器、协作服务器和安全服务器的中间件平台上。

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In hybrid form, a private cloud can include data stored on premise or off, with a private Platform-as-a-Service middleware layer managing application data and enforcing data security.

FORBES: The Data Protection And Security Case For Private Clouds