From a CC Blog Post:
The license chooser has been completely redesigned for greater clarity and ease of use.
First and foremost, the license chooser is not a registration tool. It never was. But the old chooser’s interface was a form you would fill out and submit to our server. The server would then return a page showing what license was chosen by the user, and provided HTML that the user could copy and paste onto their website. That page also provided other information and options for marking one’s work. These additional options were tucked to the side, much like fine print, so most users ignored it. What was going on here was that the form you filled out added metadata about the work you were licensing; the HTML on the results page contained that information in a standardized way so that computer programs (like search engines) could read it. The new license chooser does away with the Submit button and more clearly explains what the metadata fields are, and that they are completely optional.
The license chooser does not generate licenses. There are six Creative Commons licenses available, which work internationally, and additional ports of these six licenses exist for specific legal jurisdictions. The license chooser is an exploration tool. To underscore that, the new chooser combines the selection and results pages into four simple panels. Some information that was already on the license deeds is presented in the chooser now. This creates a nonlinear work flow: adjusting information in one panel has an impact on the contents of other panels. This encourages a kind of back-and-forth interaction, which both exposes options that may have not been clear before (like embeddable XMP metadata instead of HTML, or a simple notice for offline works) and allows the user to make a more informed decision about selecting the license most appropriate to their circumstances and the tradeoffs between various options.
Direct to Creative Commons License Chooser