There is no document as such for your query, if you want something in written about the licenses then as Pkh suggested, you should speak to your reseller or to our sales department.
As far as answers to your questions goes,
1. SBS license comes bundled with licensed for Backup Exec, Sharepoint, SQL and Exchange. and if you have setup ur SBS to use SQL on a different server than you will just need an additional Remote Agent license to backup SQL database of that other server because your BE SBS license already has a SQL license.
2. Yes, BE SBS license includes sharepoint.
3. No DLO and CPS are two different products. To know more about DLO check Admin Guide (
http://support.veritas.com/docs/338514) page no. 1543.
4. No 1 server agent means the same SBS server.
If this answers your queries then please mark it as sollution.