I want to to offer my users the ability to embedd a badge I give them on their own websites. However, I do not want them to be able to modify the code. This means that the href should always come back to my website.
Example:
<a href="http://example.com"><img src="http://badge.png"></a>
How can i ensure that they do not change the URL? Do i need to do some sort of iFrame or encryption?