Choose license

Anyone may choose a Creative Commons license by going to http://creativecommons.org/license/

Several services are available to integrate license selection into a website or application:

<a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/2.1/jp/"><img alt="Creative Commons License" style="border-width:0" src="http://i.creativecommons.org/l/by-nc-sa/2.1/jp/88x31.png"/></a>
この作品は、<a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/2.1/jp/">クリエイティブ・コモンズ・ライセンス</a>の下でライセンスされています。

Website Popup

Allows a website to give users a choice of any current CC license, generally via a popup. Javascript may be used to save license choice result in local form value -- may be integrated to any existing form on your site.

Requires some knowledge of HTML and Javascript.

Documented at Web Integration Guide

Screenshot below, example described at Movable Type.

RESTful web services API

Allows any website or application to transparently integrate CC licensing.

Requires programming.

Documented at http://api.creativecommons.org with more information including library implementations at Creative Commons Web Services.

Implementations include ccPublisher, the Microsoft Office Addin, and Drupal. Screenshot from ccPublisher:

Widget

See JsWidget.