We choose to apply the Apache License 2.0 (ALv2) : http://www.apache.org/licenses/LICENSE-2.0
As for any project, license compatibility issues may arise and should be taken care of.
Concrete instructions and tooling to keep Iceberg ALv2 compliant and limit licensing issues are to be found below.
However, we acknowledge topic's complexity, mistakes might be done and we might not get it 100% right.