Planet.Sentry will protect any type of file or data, email, attachments, local and remote files, whatever. However you look at it, Planet.Sentry is your best choice for data security. One of the greatest problems with marketing encryption software is that you need to buy two copies so you can have someone to communicate with. Not Planet.Sentry. When you register Planet.Sentry you will get TWO registration codes with each download. No you do not have to pay twice. One purchase gets you two full copies, both of which are upgradeable to the 128 bit version. Note: the 128 bitversion is not available for sale in all countries.