I will say that as far as for public release, there would definitely be an issue.
For private use if you never shared it with anyone else... can't really say anything because that gets more into like "is it legal" which is beyond my expertise. It also gets pretty theoretical since if the files produced are identical, how would anyone even know.
@chaucer
That's probably the best reply you're gonna get.
I'm gonna lean out of the window and speculate that for any actual, official reply, Touchfuzzy would have to go through the japanese dev team, contact the publisher, who'd have to contact the legal department.
The legal department wouldn't so much think about "what does the law say" but more in a "what do we want that person to do"?
There's no benefit, legally, financially, or in any other way for Degica if they'd allow that liberty for you (and others creating stuff like it)
(It'd be insanely useful for the RMV/RMZ community, but that's not a part of that calculation)
Because the legal team probably doesn't have lawyers for your country on retainer.
Corporations often make ToS or restrictions that actually aren't applicable in a country/region and would be void - or even force the publisher to stop selling in those countries, if they'd try to enforce them.
They ultimately rely on the fact that the average joe won't test the rules on whether they're actually legal binding (and, you probably don't want to be the joe that has to go through the court nonsense in case it gets tested).
As unfortunate as it may be, but the chances of Degica officially allowing for a port/modded version of the editor is practically zero.
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Though TECHNICALLY you could make an editor that only builds map & database files, and to actually create the game you'd still have to use a windows PC, put all those files into the folders of an RMZ project & deploy the game.
That would be 100% legal, actually, because your editor doesn't build the game.
It only builds JS files.
Distribution is still done via RMZ which does not replace any of their engine files. (Though you'd need to write plugins that can access whatever you add to your editor as object parameters & stuff, but you'd have to do that anyway.)
By going through RMZ as the game creator you turn your editor into something akin to a tool like photoshop.
Just like you can take a RMZ character picture and edit it - you're taking an RMZ js file and editing it.
You're not building the game or replacing the requirement of RMV as product creator.
So if you don't replace the RMZ editor entirely, and you ensure that you're just loading preexisting js files or creating them, and final deployment of a game still happens in RMZ as an RMZ game...
Then it's no different than editing js files with sublime or atom, or editing pictures with gimp or photoshop.
But if you do ever get an official message from Degica, they're not gonna tell you that.
