Saving a file of all the comments and tracked changes in a PDF document

I'm working on a document management system for my company, and would like to use Adobe.  One of the requirements of the audit chain is to record all the changes and change reason for each major version of the document.  I know how to 'turn-on' the track changes feature in Adobe, but is there a way to save a record of those changes and comments made during the change process?  And if I cant do it in Adobe, does anyone know where I can do it (I dont believe you can record those changes and comments in Word)

Thanks James