License: MIT, As clarified below (http://www.glyphicons.com/license/)
```
License for GLYPHICONS Halflings in Bootstrap
GLYPHICONS Halflings font is also released as an extension of a Bootstrap www.getbootstrap.com for free and it is released under the same license as Bootstrap. While you are not required to include attribution on your Bootstrap-based projects, I would certainly appreciate any form of support, even a nice Tweet is enough. Of course if you want, you can say thank you and support me by buying more icons on GLYPHICONS.com.
Jan Kovařík
```
ZoneMinder uses Bootstrap for UI and qualifies as a Bootstrap-based project.
Bootstrap is MIT licensed (https://github.com/twbs/bootstrap/blob/v4.1.3/LICENSE)