18. The non-transitory computer-readable storage medium of claim 17 : wherein the user input specifies content of the document at the indicated location within the document; and wherein adding the note to the note region in the note object comprises copying the specified content into the note region, the specified content associating the note region with the section of the document.
20. The non-transitory computer-readable storage medium of claim 18 , wherein the document is associated with licensing rights relating to the copying of the specified content, the computer program instructions further comprising instructions for: deauthorizing, based on the licensing rights, the copying of the specified content into the note region.