Alright, here we go.
BryonD said:
Just so long as it is unquestionably Ars Magica material. If you claim that you can take a competely non-open product and re-release as OGC without the publisher's permission, I think this is going to be a short dispute. To be clear, I KNOW that I can re-release every single bit of Mythic Heroes and be 100% compliant with the OGL. You said you could use Ars Magica in the same was as Mythic Heroes. For that to be true you MUST is effect be able to re-release ALL of Ars Magica, because I can re-release ALL of Mythic Heroes. So pick soem material that is representative of the entire product, as if you were going to do the whole thing. You do that and call Ars Magica's publishers attention to it. Get some OGL experts to agree that you have re-used AM and you are compliant at the same time. I'll do the Hero from MH.
You really up to that? (Cause you can not legally hold up your end.)
EDIT: How would you reference the source material in your Section 15?
Sigh, you keep adding conditions, which is why it took me so long.
I've no intention of reposting the entirety (or even the basics) of Ars Magica as OGC, so I've settled on presenting the basic die mechanic, the basic spellcasting mechanic, and a basic spell. I think that's about the core of Ars Magica. (Well, Ars Magica is really a great game and EVERYTHING is so different that just taking a part of it really misses the whole thing, but I think it will do.)
I didn't make a full presentation, this is just a proof of concept. But I think it is clear from my example that I CAN convert it to OGC.
There might be small errors as well, and I actually changed a few things (but not consequential ones, just changes to better fit them into the SRD mindframe); it's late, and I didn't do it as a professional project. Again, this is a proof of concept.
BTW, I didn't release ANYTHING as OGC after all... I just said I could.
The Ars Magica in OGC form is in the attached file.
I won't be calling out experts or Ars Magica's publishers. I don't see how's that relevant. (And it's not like I'm releasing Ars Magica under the OGL.) I'm confident we have plenty of people to deal with such issues here.
I am not at all sure you can release the entirety of Mythic Heroes as 100% OGC. To the extent the you can, I am confident I can release Ars Magica as well.
I don't NEED to reference the source in my Section 15. I may be deriving
ideas from Ars Magica, but I am not using any Open Game Content from it; it's right there in Section 6. The license doesn't require what it doesn't require.
BryonD said:
If your second quote is true then either you can release Ars Magic mechanics or I can't release Mythic Heroes mechanics. I know I can release Mythic Heroes mechanics. So to hold up your end you must do the same with Ars Magica.
I can't seem to communicate my intention to you.
My claim is that game mechanics and concepts are not copyrightable and as such are not protected. Ars Magica is not protected from being converted into an OGL game, Mythic Heroes is not protected from being converted into an OGC game. If you spend the time and effort of rewording and rephrasing things, and just use the ideas, nothing is protected.
Of the two options you presented, the closest is the second. You can't release Mythic Heroes mechanics
derived from its OGC since the work contains no OGC mechanics.
Edit: I used "Exploding" die terminology, as I believe it is in the public domain. Don't hold it against me, it's an easily changable detail.