Security Server or Client Side

[#1]

Hi,

I have some qvw's to be published on the web server and I'm a little confused after watching to these videos QlikView Security Video Series (6 of 8): Centralized Section Access Control - YouTube

It seems I can restrict user data visualization by creating an hidden script or doing it as a task on the publish server.

When should I use one or another?

Thanks,

Miguel