Identifying a linearized pdf

I am trying to programmatically identify a linearized pdf but have encountered an issue!
When a pdf is first saved as a linearized document a <<Linearization>> directory is added to the file.
However, if such a linearized document is now saved as a non-linearized document, the <<Linearization>> directory remains in the file.
But, both Reader and Acrobat are able to distinguish this and correctly identify the linearization status.
Does anyone have any idea how this is achieved?

Many thanks Leonard. We will investigate.
We have done some further tests and are wondering if this situation arises - with respect - from a bug in Acrobat? However, I am not sure if this is the correct place to raise it? I have included details below. Perhaps you could comment or pass on to the correct person.
1. Create a PDF document from a source document and Save As (not Save) with Save As optimizes for Fast Web View checked. This creates a linearized file. Opening the file in Acrobat/Reader and viewing properties - the Fast Web View property is 'Yes'. Opening the file in a text editor confirms that the <<Linearization>> dictionary is present.
2. Open the PDF generated in 1 above in Acrobat. Uncheck the Save As optimizes for Fast Web View checkbox and perform a Save As (again not Save). This saves the file as a non-linearized file. Opening the file in Acrobat/Reader and viewing properties - the Fast Web View property is 'No'. Opening the file in a text editor confirms that the <<Linearization>> dictionary is not present - that is, it has been removed.
However...
3. Open the PDF generated in 1 above in Acrobat. Make a small change - ie. add a keyword or something (a change is need in order to be able to save the file) now Save (not Save As). This saves the file as a non-linearized file. Opening the file in Acrobat/Reader and viewing properties - the Fast Web View property is 'No'. However, opening the file in a text editor shows that the <<Linearization>> dictionary is still present. This seems to be incorrect/an error?
As I have said, I appreciate that you may not necessarily be the correct person to raise this with. Apologies for the inconvenience if you are not. Nevertheless, if this is the case perhaps you would be kind enough to pass on.
If you are the right person, I'd appreciate hearing your comments - many thanks.

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From: Adobe Forums <[email protected]<mailto:[email protected]>>
Reply-To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>>
Date: Thu, 15 Dec 2011 02:27:21 -0800
To: Leonard Rosenthol <[email protected]<mailto:[email protected]>>
Subject: how to identify fonts in pdf using vc++
how to identify fonts in pdf using vc++
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