iTunes

Yes you can watch any movie you have downloaded to your iPad from iTunes or other services on your iPad without a WiFi connection. You do need WiFi to download a movie from iTunes, but once it is finished downloading you will be able to watch it on an airplane or while traveling.

You can use Apple's Home Sharing network to import up to five items to your home computer from iTunes or to stream content from Apple TV. To enable Home Sharing on your computer you will need an Apple ID and iTunes installed on the computer you want to use.

Yes. All content in Apple's iTunes and App store is rated, and Explicit content or R-rated movies can be blocked. Follow these steps to enable Restrictions on your iOS device:

1. Navigate to General > Restrictions
2. Choose and enter a passcode

From here you can restrict complete access to certain apps such as Safari or iTunes, and you can also restrict access to specific content types like Explicit music, R-rated movies or TV-MA television shows.

Sometimes, all music, app and book purchases are limited to 100MB or smaller over a cellular data network. This means you will need to be connected to a Wi-Fi network to download purchases over 100MB. All movie and TV show downloads require a Wi-Fi connection, and can never be downloaded over a cellular network.

You can set your iPad to automatically download new music, apps and books made on other devices by following these steps:

1. Navigate to Settings > iTunes & App Stores on your device.
2. Tap "Sign In" if you're not already signed in to the iTunes Store.
3. Enter your Apple ID and password.
4. Tap to enable or disable Automatic Downloads for each content type.

You will need iTunes 10.3.3 and iOS 4.3.3 or later, or iOS 5 or later for the iPhone CDMA model to enable automatic downloads.