as in Deepsea
Correct, same as copyright. You don't have to. However, if you read up more, it is wise to do so from a commercial POV. (Otherwise why do any of it - must be a reason eh)
I read the url you gave and it explains that something does not need to be registered
If you want to discourage yourself, you just did. IOW, that implies (from your pov) you can't use even "simulated" imps, cyber demons, BFGs etc. It's a fact you are going to have exactly those elements in FREEDOOM. So using your POV, I argue that ALL the enemies are exactly as they are in DOOM. Replacing them with new graphics does not change their status as an imp, cyber demon, BFG, etc. Do you see where this is going?
You can make a completely different game using the code with our blessing, but if it has imps, cyber demons, BFGs, etc, then you are treading on thin ice.
Now it's pretty obvious that is again just not so. For one thing, that's been going on for literally years - sprite replacements for same. ID allowing that to go on for all that time, basically denies them any right to complain now since this can for all practical purposes be considered a giant PWAD (just keep reading those references), an accepted form of modification.
I think its safe to say that all of you believe you can replace the raw graphics with anything you like (except UAC<g>). Why? (IOW, why did you bring up the Carmack quote since you clearly disregarded it?)
Well I hope I demonstrated that this argument doesn't stick together well. You are willing to "replace" the sprites with new "bits" yet somehow think UAC is sacred? Just like the sprites, UAC is nothing more or less sacred as a collection of bits. OTOH, if you want to be consistent and include everything, then nothing can be done.
I take "imps, cyberdemons, BFGs, etc" to include the UAC name as well
Let's to an even simpler example, the textures. Clearly everyone also believes those are not a problem. Why not? IOW, why is there not a problem with you making an xWAD using those texture NAMES. Using your type of "cautious" reasoning, the names are copyrighted and you can't use them. True?
Well, I hope I raised some more doubt over the other issues then, because they ALL fall into the same type of "doubt" argument you present.
I'm not a lawyer, but there clearly is some doubt over the legality of the Freedoom name, so I'd personally rather stay on the cautious side and avoid it.
The bottom line is this - either Id cares about you releasing an IWAD that is compatible with (and a replacement for) DOOMII or they don't. Nothing else matters.
So write and ask if it's ok to do this. None of what is opined (even for stuff that everyone seems to think is ok) matters a bit if Id doesn't like what you are doing.
This is at some risk of opening up a can of worms larger than just using the "FREEDOOM" name, since Carmack most likely will not be the one that will answer you. If you don't write, you risk the problems noted earlier (taking the "cautious" approach) and then what?
Please don't argue just to try to prove me wrong. Instead, take the positive aspects and see that they all fit in with what you have done so far. I hope you saw that I can push it either way and show how none of this can be done using -consistent- logic, not just emotional feelings.