Autopaste Source Url

Autopaste Source Url
i need a joomla extension that will, when enabled, make this possible:

if someone copy text from my articles, it will automaticly include the source url (read more) after he pastes it.

for example try coping and pasting some text from here http://www.knowledgebase-script.com/demo/article-67.html

please make bid and explain that you have understand what i want.

thank you