Note that the spouse who files a restricted application must be at least full retirement age.

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In order to do this and still delay his benefits, he would file a Restricted Application for Spousal Benefits Only with the SSA. This type of application restricts the filing solely to Spousal Benefits.

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Another use of a "restricted" application: Say a 66-year-old husband decides it makes sense for him to delay his benefits until he's 70.

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The ability to change and invent must be able to be restricted to certain parts of an application or an instances of an application.

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Mr Attwood said he was restricted in what he could therefore say as this was a live application but acknowledged it was "a matter of controversy".

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One application, called Shibboleth, is a piece of open source software that enables users to share restricted online resources.

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