Mesa in packman repos

Stupid question of today: why is there a MESA version in the packman repos if opensuse provides one too? To be clear I am talking about the Tumbleweed repos. I recall some graphic card reason, but it is a recall that comes remotely and long time ago. So since this recently caused me some trouble because of shifting repo here and there I wanted to understand. Someone can maybe educate me on this. I do not think that patent rights can be an issue here. Thank you in advance. P.S. this is a re-invoice of the very message. The first vanished, maybe you should check that spamfilter recognize your registered members?