LIveCycle Reader Extensions Server is a server based program that runs on an application server (JBoss, WebLogoc or Websphere) on just about any platform (Windows, Linix, AIX etc...). It also requires a database to store its information in it. Once it is loaded and ready it provides a web interface (Flash based) that any of your user (assuming you have given then the rights) that will allow them to apply the rights to the form. The good news is that there is a turnkey install that will load an app server (JBoss) and a database (MySQL) that is all you need. You merely need to supply a Windows server box (4 Gigs of Ram) is recommended but that is for the whole suite.
Hope that helps
Paul