License issue for images and icons

We are planning to build openfire package ourselves with the default settings and plugins (some are from Ignite Realtime: Openfire Plugins). I noticed that there is a license from images and icons, which make me confuse.

I want to know which images or icons can be delivered in such a customized openfire package, and won’t break the license here https://www.igniterealtime.org/builds/openfire/docs/latest/README.html.

Can we build our own openfire with those images and icons for free? We just use all those images or icons as it is. Never use them in our own products.

Thanks a lot