How to Disable "Edit Report" option in PowerView Report in SharePoint 2013.

I'm showing a powerview report in a page, I need to disable either "Edit Report or Save" option for a particular group.

Environment: SharePoint 2013- Sandboxed Solution.

I have tried the below link for the same, but end up with no luck:

http://technet.microsoft.com/en-us/library/hh231522.aspx

Any help on this is really appreciated.

Regards

Seva