Zend宣布针对云计算的新的PHP许可选择
近日，Zend针对其PHP产品线宣布了一个Zend无限订阅的许可选择，用于解决云计算环境下软件运行实例经常发生变化所导致的许可问题。 虚拟化与云计算技术对传统的软件许可模式（比如说每个用户一个许可、每个服务器一个许可）提出了挑战。在使用这两种技术的环
近日，Zend针对其PHP产品线宣布了一个“Zend无限订阅”的许可选择，用于解决云计算环境下软件运行实例经常发生变化所导致的许可问题。
虚拟化与云计算技术对传统的软件许可模式（比如说每个用户一个许可、每个服务器一个许可）提出了挑战。在使用这两种技术的环境下，运行的软件数量经常会发生变化，如果手头没有充足的许可，新运行的实例可能会违背许可要求。
这并非一个新问题。早在2008年，InfoQ就曾报道过，微软开始澄清在虚拟化环境下其产品的许可问题。其他一些公司于2006年就开始重新思考由于多核与hypervisor技术的巨大变化所导致的软件许可问题。SaaS和开源许可是厂商解决变化的软件许可问题的一种解决方案。
Zend的此次声明主要是针对其PHP产品线许可，包括应用服务器（Zend Server）、多服务器的应用管理器（Zend Server Cluster Manager）以及一个PHP IDE（Zend Studio）。对这些产品的支持也有一个无限的许可选择。此次声明的重要性与PHP日益成为服务器端应用的普遍标准是密切相关的。Zend标榜自己是个 “PHP公司”，无限许可旨在为那些采用PHP进行服务器端Web应用开发的公司提供一定的竞争优势。
许可问题难免要经历协商的过程，作为读者的你来说，当公司迁移到云和虚拟化数据中心时，你们会采取何种解决方案呢？
http://www.infoq.com/news/2010/09/zend-php-licensing
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