要使用OTA iPhone应用程序，尝试下载该应用程序的人必须安装正确的证书。

In order to use OTA iPhone app, the person who is attempting to download the app must install the proper certificate.

Enterprise Apps是限制为1000次OTA安装，Apple可以跟踪这些安装。

Enterprise Apps are limited to 1000 OTA installs, which Apple can track on their end.

对于非企业开发者帐户，您有100个设备限制，首先必须获得设备UDID直到供应门户，才可以

For non enterprise developer accounts, you have a 100 device limit, which first have to get the device UDID up to the provisioning portal, before they can install the proper certificate to run the app.

因此，尽管您可以免费分发ipa（通过HTTP或FTP或whatevs），它们仍然需要适当的有效证书。 ，并且可以控制。

So while you can free distribute the ipa (over HTTP or FTP or whatevs) they'll still need the proper valid certificate, and that is controlled.

当然，可能有一些解决方法，但总的来说，这就是Apple保护OTA安装的方式。

Of course there are probably ways around this, but in general that's how Apple protects OTA installs.