The license for rust-ipnetwork changed to "MIT or Apache-2.0" upstream [1].
This is reflected in the PR to distgit [2] to update to the latest version.
Dusty
[1]
https://github.com/achanda/ipnetwork/commit/fa128680b51fbcf9c37db99f011c9...
[2]
https://src.fedoraproject.org/rpms/rust-ipnetwork/pull-request/1