[ropyeett]

https://ubuntu.com/legal/contributors/agreement for the details.

In short, you don't lose your own copyright but you grant them a license to do whatever they want including re-license as they wish without having to ever consult you, allowing for your code to be used within their closed source projects under any license they wish.

[jraph]

Ah, right, it's not a copyright assignment, but there is a CLA. Confused the two concepts, rookie mistake. So yeah, not good. I will edit my comment. I would even say that not mentioning the CLA and mentioning the absence of copyright assignment in the announcement is quite dishonest.

[stgraber]

Yes it is indeed

[jraph]

My best wishes for your fork!