Ubuntuone-php-client-library is a project mainly written in ..., based on the View license.
A PHP client library for Ubuntu One APIs. With this library you can interact with Ubuntu One APIs. Now it supports files apis and account apis.
This is a library written in PHP to interact with Ubuntu One APIs that you can find here https://one.ubuntu.com/developer/.
This library is released under the GNU LGPL v3 license, you can find the full text of the license in the LICENSE file.
You can use thi library in your project even if it is not open source.
You can find more information on how to install and use this library in the wiki, there are also several examples.