Having chosen my Creative Commons license, I then needed to display it on my blog. I felt that the WordPress sidebar would be the most appropriate place.
The Creative Commons people give authors a nice little graphic to link to that is customized for each particular type of license. Here’s the logo for my license:

I thought that it should be straightforward to put the logo in my blog’s sidebar, but that proved to be a little optimistic.
The Creative Commons website generates some code for authors to copy and paste into their own site in order to display the logo. The website also has some instructions for pasting the code into a few popular blogging packages, but WordPress is not one of them. Unfortunately, it’s not a simple cut-and-paste job to use this in the WordPress.com sidebar.
The raw code has a lot of data that can’t be used on WordPress.
In order to work in a WordPress sidebar widget, the code between, and including, all instances of <!- and -> should be deleted. This action simplifies the original code to:
<a rel="license"
href="http://…snip…">
<img alt="Creative Commons License"
style="border-width: 0"
src="http://…snip…"/></a><br/>
This work is licensed under a
<a rel="license" href="…snip…">
Creative Commons Attribution-Noncommercial-Share Alike 2.5 License</a>.
Still, though, this code would not display the logo in my sidebar.
I am by no means proficient with HTML. Still, I noticed that the alt and style modifiers for the img tag were before the src call. I thought that was backwards, so I reversed them. I also thought the style modifier was unnecessary, so I deleted it.
My final code was:
<a rel="license"
href="http://…snip…">
<img src="http://…snip…"
alt="Creative Commons License" /></a><br>
This work is licensed under a
<a rel="license" href="http://…snip…">
Creative Commons Attribution-Noncommercial-Share Alike 2.5 License</a>.
This worked!