Implementing Data Security in SSRS Report Model

This is a good blog on explaining the Data Security within SQL Server Reporting Services (SSRS)

Bob's SQL Reporting Services Blog : Implementing Data Security in a Report Model

We are also looking at doing our own custom data security, so we can do it through our own groups and permissions within our application.

Why aren't my CHM Files working?

The CHM viewer component is not properly registered on your PC
The system file <WINDOWS>\system32\hhctrl.ocx may get missing, corrupted, or unregistered.

Solution: Run "regsvr32 hhctrl.ocx" command from the command line to register the library in the system.

A security update for Windows XP® may block access to CHM files
Windows XP® security update blocks active content in CHM files to protect your system security. Additional information is available here.

Solution: Run Windows Explorer, right-click on the CHM file, and select Properties from the popup menu. Click on the Unblock button immediately below the Advanced button on the General page. Click Apply to show the content. Once the CHM file has been unblocked, the Unblock button disappears.

Go here for other issues/solutions