The other code was release before it was merged into Apache Kafka. So the original copyright was with Alexis and Lightbend (ie, Lightbend copied Alexis code and later contributed it to AK).
For regular PRs, the contributor license agreement states, the ASF gets the copyright (from my understanding---also not a lawyer). Otherwise, it would also be a hassle to add copyright to any file that is changed... Also not a lawyer, but please read https://www.apache.org/licenses/icla.pdf (for committers it's required to file this -- for contributors consider the wiki information: https://cwiki.apache.org/confluence/display/KAFKA/Contributing+Code+Changes ``` When you contribute code, you affirm that the contribution is your original work and that you license the work to the project under the project's open source license. Whether or not you state this explicitly, by submitting any copyrighted material via pull request, email, or other means you agree to license the material under the project's open source license and warrant that you have the legal authority to do so. ``` [ Full content available at: https://github.com/apache/kafka/pull/5551 ] This message was relayed via gitbox.apache.org for [email protected]
