Q) As can also block the export to excel among other means of security?
Yes, you can block Excel export from users, I can think of two ways
1) You can disable exports in the document properties, security tab.
2)Another way would be disabling all exports in the server configurations. QEMC--> Documents --> User Documents --> Server --> Availibility --> Print and export to excel option --> Specify the users you want to allow this features.