Looking for a very secure file manager app that will show files and then an app that I can lock and have all info. stored to my device or SD card. I'm in law enforcement and with this new tab wondering if there is anything out there that secure. And yes, I have searched but need advice to the most secure and reliable. Don't want information in the "clouds". Also, wanting to use handwriting app(have downloaded Handwriting app free) so to use stylus and take notes at meeting but they need to be saved and not vulnerable. Thanks!