European Sar Data - Terms of Use

Hi everyone.

First, I’d like to apologize in advance if this thread is quite off-topic, as I didn’t really know where to post it, and I guessed that people going around with ST1BX might know the anwser.

I’ve been searching for the terms of use of European Sar Missions, and if it’s actually really clear for Sentinel Data, it’s not exactly the same for older missions like Envisat or ERS.
For instance, I’ve been able to find that Envisat data was distributed by an exterior provider, but it has ended the arrival of Copernicus Hub. Moreover, now the EO Data portal has setup the On-The-Fly data access, and even after reading everything that was given to me, I can’t really tell if it’s possible to use Envisat SAR data for commercial use…

Has anyone a clear view on this topic ?
Thanks in advance.