are released under the Creative Commons Attribution 3.0 Unported (CC BY 3.0). The Glyphicons FREE can be used both commercially and for personal use, but you must always add a link to glyphicons.com in a prominent place (e.g. the footer of a website), include the CC-BY license and the reference to glyphicons.com on every page using Glyphicons.
Hover your mouse over the images right to see their CSS classes.