Reuse of PierSecurity or Spielverderber without Pier in Seaside Application

Hi,

I need, for my seaside application, security and authentification.
I've seen PierSecurity and Spielverder. This 2 packages will be very
usefull if I success tu use one without pier.
What's your feeling about this?
Do you think it's possible to reuse Spielverder without pier for example?

maybe you know other security/authentification packages?