I get sensitive doc for example emailed to me thats zipped/passworded, I unzip it, work on it and rezip with password and send back. I don't know if this is possible maybe I'm paranoid, but the orig file is still there and if I delete it, then lose my phone it may still be recovered.
By the way ZDBox jammed my phone down to a crawl. I had to take it off.
Thanks.