There is an increasing movement to openly share information and to encourage people to re-share through Twitter or any of the other social channels. Many do not want to attach strict copyright to such work, but still want to be attributed. They may wish to only share if the work is not edited or is not used for monetary gain. The use of Creative Commons licences is an excellent way to ensure it is clear what you are happy with.
You may notice on the right side of this blog, I have stated my work has a Creative Commons licence which asks that my name is attributed (BY) if any of my work is re-shared but that it should not be altered (ND) or used commercially (NC). I also apply this licence to any presentations I give and upload on to Slideshare. This gives people permission to openly share your work.
The infographic below created by Martin Missfeldt is an excellent visual which explains the six Creative Commons licencing models you may choose from.
To learn more about the use of copyright and the use of other people’s images you may be interested in a previous post where I look at the use of Creative Commons licenced images
To choose and add a Creative Commons licence logo to your own website or blog, visit the Creative Commons interactive licence logo maker.
Sue Beckingham
Social Media for Learning 
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I, like you, use the Twenty Ten theme. i was hoping to find a step by step procedure for inserting the Creative Common Image and text that you have in your sidebar. If you have one please post it. I am surprised that they (CC) or someone else has not created a WordPress Widget for exactly that purpose.
The embed code is available on the Creative Commons website. http://creativecommons.org/choose/