Creative Commons provides free tools that let authors, scientists, artists, and educators easily mark their creative work with the freedoms they want it to carry. You can use CC to change your copyright terms from "All Rights Reserved" to "Some Rights Reserved."
To get the creative commons license for your blog go to http://creativecommons.org [ Opens in a New Window ]. On the top of the page, click "License you work" link to continue. On the next screen you can select the licensing options for your blog.
After you select your license you can choose a graphic for the license and the HTML code will be generated on the page.
Classic templates users of blogger can copy-paste the HTML code into their template. XML Blogger users see this post on How to add HTML/JavaScript to Blogger.