I just purchased an Ipad and I had a question about security and confidentiality: I am not completely sure if I'm going to keep the Ipad or return it. In order to determine that, I need to be able to work on it. If I open up highly confidential Excel files, Word docs and PDFs on the Ipad (through dropbox and email, most likely) but ultimately decide to return the Ipad, can I be certain that those documents will not be viewable to an Apple tech or refurb customer? Is there a way to clear the system or the cache with certainty? For instance, in the past when I've sold or donated a laptop/computer, I've used software to shred files and then re-installed the OS, to wipe over any remnants of those files. Can one do this with the Ipad? Thanks.