A dialog will appear requesting user permission to enable Bluetooth, as shown in Figure 1.

一个对话框将会出现，请求用户开启蓝牙，像在图1中展示的那样。

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For example, a proprietary software license may grant a user permission to run a program, but not see its source code.

例如，一个专有软件许可可能允许用户运行程序，但不能查看源代码。

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If you grant a user permission to list the contents of a directory, then the user can see the contents of the directory.

如果您授予用户的权限列表的目录的内容，用户可以看到该目录的内容。

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The group has also done the same with the phone's mics (which they say samples data at a whopping 44, 000 times per second vs. the accelerometer's 100), but note that it's a less likely option given the usual need for some form of user permission.

ENGADGET: Georgia Tech spies on nearby keyboards with iPhone 4 accelerometer, creates spiPhone

For sensitive data such as telephone numbers, postal and e-mail addresses, social security numbers or financial data, a site would have to explicitly request a user's permission to track and store the information.

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Following an investigation by the Canadian Privacy Commissioner, Facebook in June limited applications to accessing only the public parts of a user's profile, unless the user grants additional permission. (Canadian officials later expressed satisfaction with Facebook's steps.) Previously, applications could tap any data the user had access to, including detailed profiles and information about a user's friends.

WSJ: Facebook in Online Privacy Breach; Applications Transmitting Identifying Information