Jenilyn
You can implement SSO for BPC 10 and EPM add-in without buying SAP SSO 2.0 license. You can instead buy a different product. It is not possible to implement this for free unless you use a portal and require users to logon to portal, login to BPC Web and launch Excel from the link provided. Of course, it is much better if the end user just opens Excel and logs into BPC without needing any additional credentials or needing to login to portal.
Thanks
TIm