WE have always tried to be compatible with existing ASP.NET/WCF/Data Services/Web API infrastructure as much as possible so in most of the cases you can research topics on MSDN (or Stack Overflow) for the standard Microsoft implementation and then apply the same patterns on the service code generated by Add Telerik Data Access Service
In regard for securing your service layer - you can use the same approach.
As each service technology stack has it's own way of restricting access, please let us know which service type (or types) are you interested in. In practice the environment where the service will be hosted and will operate has implications over the way it can be secured so please give us any important details about your planned project structure and relationships between different client, service and web site components.
OpenAccess ORM is now Telerik Data Access
. For more information on the new names, please, check out the Telerik Product Map