"The licensor cannot revoke these freedoms" → so you can't privatize or lock it. You can sell it as Bidgehop wrote, I'm fine with this.
Regarding agreeing on art display to serve the opinions of someone else or not; the license also requests "You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use." So reusing doesn't mean I endorse the talk, etc...