If you signed a CLA to contribute, you've granted Redis a broad license to do whatever they want with your contribution. If you contributed to a BSD licensed project, then you contributed to a project who's licensing terms says "do whatever you want, just retain the copyright notice, and this license is not an endorsement".
You basically have no grounds for suing, especially since the re-licensing is not retroactive. The exact contributions that you provided as still available in the exact form and license that you contributed them to.
You need to be much more specific about what you want to prevent.
You basically have no grounds for suing, especially since the re-licensing is not retroactive. The exact contributions that you provided as still available in the exact form and license that you contributed them to.
You need to be much more specific about what you want to prevent.