We do copy various data by Ctrl+c for pasting elsewhere. This copied data is stored in clipboard and is accessible from the net by a combination of Java scripts and ASP. Do not keep sensitive data (like credit card numbers, bank login/ passwords, PIN, date of births, etc.) in the clipboard while surfing the web. Instead make a practice of typing them always. It is extremely easy to extract the text stored in the clipboard to steal your sensitive information.

Just try this,
1) Copy any text by Ctrl+c
2) Now, click the Link: http://www.friendlycanadian.com/applications/clipboard.htm
3) You will see the SAME text you copied is accessed by this web page.

Note, it affects Internet Explorer Users.

Thanks to GWONG at maxis dot com dot my for this awareness.