ktsirig

Hello all,
I want to secure a page which uses the script of "phplist". Basically this script stores username, name, surname, email etc of users in order for the company to send newsletters to their clients.
Except from stripping slashes,backslashes etc or special characters, are there any other ways to prevent the data stored in the db from somenone that wants to "lay their hands" on them?

Thank you!