The email marketing system was designed with a maximum data confidentiality in mind. 

If DynamicText is used, only the set of information, which is really needed to create personalized e-mails, is transmitted to our servers.

Only the result of DynamicText functions is transmitted. The database information, which was used to generate the result, and the DynamicText function itself will be kept secret, giving you a minimum exposure of your database data.

Example:

This DynamicText function prints different text to the e-mail text depending on the value of the database field [num_purchases]. If [num_purchases] is greater than 10, "Special Offer" is printed, "Normal Offer" otherwise.

Evaluate(If(GreaterThan([num_purchases];10);Special Offer;Normal Offer))

DynamicText will not transmit the value of [num_purchases], but only the result of the above function (which is "Special Offer" or "Normal"). In this example no database information at all is exposed.