With reference to “Be Careful with CTRL+C” post, posted below by Jannik, this is the solution I know for this problem...
We can configure IE to restrict this behavior. The following settings are required- Internet Explorer 5 and 6
1. In Control Panel, click Internet Options.
2. Click the Security tab.
3. Under Select a Web content zone to specify its security settings, click the zone 'Internet' where you want to prevent Web sites from accessing your clipboard.
4. Click Custom Level.
5. In the Scripting section, under Allow paste operations via script, click Prompt or Disable.
6. Click OK.
source: CTRL+C solution