The OLE DB providers are available for download from support.sas.com. I don't believe that any special license is required to use them, given that your end users (if any) download and install the providers as needed. Many SAS applications (SAS Enterprise Guide, SAS Add-In for Microsoft Office, SAS Foundation for Windows) already include the providers in their installations.
If you are using the SAS OLE DB IOM provider, you'll need SAS Integration Technologies to connect to a remote SAS server.
Chris