RadDocument does not have such document properties, as such properties are not directly related to the implementation of RadRichTextBox, but to the specific use of the control. Logically, this information does not belong to the document and had better be saved somewhere else.
For example, if you are saving the documents in a database, what you can do is to add a field to store this information. In case you are saving the documents as files, this meta data can be included in the name of the file or even in the path where you store the document.
Having said that, if you still believe that the document is the right place to include such metadata, there is a way to add this information to the document. You could use the DocumentVariables property of RadDocument like this:
This property will be exported like this:
and after import, its value can be retrieved as follows:
I hope this answers your question.
All the best,
the Telerik team
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