Based on demand to use the wireframe icons on web sites, and to use them in Adobe Illustrator and Visio, I’ve created EPS and PNG versions that include a Royalty Free license agreement. You may use them in your UX documents, but the license also permits you to use them in web sites.
There are restrictions for use on commercial products or commercial applications that offer products
or services for sale or for fee-based usage, however. For details on the license and prohibited uses, please see the Royalty Free License Agreement.