If you are attempting to review an academic paper, there is a tradition that the reviewers are anonoymous so that they can comment without fear of the authors (or something).
If you have to upload a PDF of your comments on the paper you probably want to get rid of all that personal information, that appears in document properties. To do this in OpenOffice V2:
File -> Properties. Then: Uncheck the apply user data button and hit the Delete button on the right. Then when you export the PDF should not contain all your user data!