How to disable silverlight "Do you want to allow this Web application to access your clipboard?" popup window, when tyring to right click and paste?

Hi,

When im trying to right click and choose paste. im getting a dialog box.. "Do you want to allow this Web application to access your clipboard?". How do i disable it for all users?

i found that, we can able to disable it for only one user, if we create a 'Clipboard' DWORD key with value '11' in the registry path: HKEY_USERS -> S-1-5-21-159.. -> Software -> AppDataFlow -> Software -> Microsoft -> Silverlight -> [website url]

Even, i tried

Internet Options> Security> Internet Zone> Custom Level> Scripting section> Allow Programmatic clipboard access> Enable. But its not working.

Please let me know how to disable that popup for all users?