Question : Offline Application - ADO.NET Sync Framework or Smart Client Offline App Block

I want to develop a windows application that connects to a database over internet and I want it also to work offline.
From my point of view, ADO.NET Sync Framework is the first choice. But I have some requirements that I think Sync Service will not address.
1- Clients can't connect directly to remote database. I have to use web services. I think I read somewhere that I can user WCF Data Service. but I don't know how.
2- Clients have different authorization rules. I mean each client has access to his own set of data from the same table. So I can't download whole table to client PC. When a client requests for a table (changed data from server), only those data who client has access must be returned. I don't know how to do it with Sync Service.

Answer : Offline Application - ADO.NET Sync Framework or Smart Client Offline App Block

Well. since no one is answering, I'll answer myself.
I didn't go around Offline App Block. I found good articles about ADO.NET Sync Framework:

Sync Framework with WCF:    http://www.codeproject.com/KB/smart/sync_services.aspx

Securing WCF:
http://www.theserverside.net/tt/articles/showarticle.tss?id=SecuringWCFService
http://nayyeri.net/custom-username-and-password-authentication-in-wcf-3-5

To bypass Certificate validation on secure WCF services:
http://webservices20.blogspot.com/2008/12/wcf-gotcha-disabling-ssl-validation.html