How to retrieve access rights for an user/usergroup ?

Hello everybody.

I'm working on BO XI 3.1. And I have to develop with the .NET SDK package an application that retrieves the following data :

- the access rights to WEBI application and properties for each user/user group.

- the access rights to each folder and properties for each user/user group.

etc

The idea is to retrieve for an user/usergroup the access right on each property of WEBI application and softwares. and same thing for folders....

I'm looking at the .NET SDK package contents but it takes me a lot of time, even too compared to my deadlines. So I'm looking for help.

Does anyone have an idea about class of objects, properties and methods to use ?

Thank you in advance for your help.