První odkaz z Googlu:
1. Go to Tools -> Internet Options.
2. Go to Security tab.
3. Select “Internet” zone, then click on “Custom level…” button.
4. Scroll down to “Scripting” section (at the bottom few).
5. Under “Allow Programmatic clipboard access” option, check or select (tick) Enable. Default action for this option is Prompt, which cause the pop-up message whenever there is any attempt to access the Clipboard.
6. Click Ok twice to exit from Internet Options.
http://www.mydigitallife.info/2006/09/25/disable-al low-this-webpage-to-access-your-clipboard-pop-up-w a rning-message-in-ie7/