Due to the nature of how the English market came to learn about RPG Maker, there are far more unofficial, and pirated resources out there that makes it legally dubious if those assets or resources can be used.
A) I have purchased RPG Maker MV, and primarily use the MV editor and resources = No problem
I purchased an earlier version of RPG Maker and use resources purchased from EB/DEGICA to use with it in MV, using MV's editor = No problem
Those above have been repeatedly stated to be OK. Here's some areas that look grey but aren't:
C) RPG Maker MV was purchased, but the user of MV decides to use a different product after starting their project with MV = Not OK unless the RPG Maker assets are removed. Reasoning: license. This does not count as piracy but is prohibited by license.
D) A user uses the trial version of RPG Maker MV to create a game, but then never purchases MV and continues to use the assets with the other product = Not OK. Reasoning : license. This counts as piracy since the user has no license to use the assets for any reason outside the MV trial.
E) A user obtains the RPG Maker MV (or any other version) assets (RTP) from a fan community in order to localize a Japanese-language RPG Maker game. Regardless of any permission obtained from the Japanese author, this would not be permitted since the RPG Maker license belongs to the original author. In this case the person doing the localization would need both the Japanese and the English (or whatever locale) language version of the product to have the rights to the RTP assets and editors since the original author can't transfer the license. Assuming they did obtain permission to localize, this comes back to everyone who works on a project needs their own copy of the software if they are unable to use the same machine that it is installed to.
Plus the Never OK's:
F) RPG Maker assets were obtained from a fan community, but the user doesn't own any RPG Maker licenses. It's considered piracy.
G) RPG Maker was obtained from an unauthorized source. This is also piracy.
What has come up in this thread is how much of RPG Maker MV must be used to use the assets. Which is to echo the statement again "If you can not open the game with the MV editor, make any non-trivial edit to the game, and save it" it's still an MV game
. The reason this is the legal test of it being an MV game is that the Assets can only be used with theMV Editor. Is it possible to make it possible to minimally use the MV editor? Yes. Would that make it still a MV game? Yes, but if you did this primarily to fulfill the license obligation, if it were to be tested in court, one would be asked "List all software packages used to build this game." and lying under oath is a crime. Any other software products used would be discovered during discovery, that includes emails and how those software packages were obtained.
So ultimately is it really in ones best interests to weasel around the license? No. It would be very expensive and waste a lot of peoples time.