Is it Illegal to Use Assets from Another Game for Research Purposes?

It is illegall. When signing to an EULA it is explicitly written that you are making a legal agreement. It’s the same as signing a document by hand.

And now let’s think about it, you make a legal agreemet with somone, that you pay him 10.000$ after he does something. He does it. And you do not pay, saying, hecan’t frce you to pay, you have your own choice , he can’t force you, and agreemnt doesn’t mean anything and doesn’t matter.
It does. And it’s absolutely the same.

Same for ue4, you sign to the eula in which it is written that you have to pay 5% revenue, same, if you wouldn’t pay it it would be illegal, and it is jsut a EULA.

You may not, if it is stated in the EULA you accepted (same as signed), and it usually is, reverse engineer content from the game. They actually can sue you, and will win for 100%. The thing in question is how much they will want to bring you down. They may just request deleting the reverse engineered content, but they may also request payig a 100.000$ fine. Of course, the judge wouldn’t propably agree with that, but he would propably request you to pay something around 5000-10000 $.

You may discuss with us about , and you propably won’t get caught if you do it, even if you would, they wouldn’t propably care. But it **is **illegal, and if they wanted they could force legal consequences.