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Content Type Access Control
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There are two approaches you can use to control who can access the content types you create, each with its own advantages.
You can specify that a content type be hidden. Hidden content types are not displayed on the New menu for list views. Therefore, users cannot create new items of that content type from the list. The content type is still displayed everywhere else in the user interface.
You can also add your content type to the predefined "_Hidden" content type group. Content types belonging to the "_Hidden" group are not displayed in the user interface on the list of available content types for lists.
Using the object model, you can access a content type belonging to the "_Hidden" group as you would any other content type.
The content type group name "_Hidden" is case-sensitive.