I've found a way to play splitscreen on Minecraft PC thanks to the internet where I run the game twice or thrice on the same computer on the same account but just change the name of the player in notepad.
I've got two copies of the bedrock edition on PS3 and PS4 and the splitscreen is dull without mods so I want to play splitscreen on PC with my friends in a few days. They have copies of the bedrock edition too.
I've looked at the EULA and saw this:
"This also means you cannot sell or rent the Game, or make it available for access to other people"
"let other people get access to anything we've made in a way that is unfair or unreasonable"
https://account.mojang.com/documents/minecraft_eula
Does this mean I can't do splitscreen with my friends? I've sent Mojang a support ticket which is taking ages, probably half a month for them to reply.
Here is a Minecraft PC splitscreen in the picture, I've used the joypad mod for controller. This is a test, my friends weren't playing here.
Best Answer
I'm no lawyer, but it's best to say that it is against the EULA (https://account.mojang.com/documents/minecraft_eula) to play splitscreen on PC with friends.
You see, the EULA states that "When you buy our Game, you receive a license that gives you permission to install the Game on your own personal device and use and play it on that device as set out in this EULA"
When you buy the game, it gives you the "right" to download and play it on your personal device. As long as it is on your personal device, it is completely OK to do anything you desire with it. That applies to your friends too. They also have the right to play it ONLY on their own personal device.
It also says that "This also means you cannot sell or rent the Game, or make it available for access to other people and you cannot pass on or resell any license keys"
Now this section states that it can't be made available for people who have not bought the game. Since your friends have bought Bedrock Edition, you have a reason to say it's legal.
But, I would not say that it's legal. Your friends have bought a completely different version for a completely different price. They are to download it on their personal device and only use it on their personal device. Buying one version of the game does not entitle them to having the right to play on any of the other versions.
And playing splitscreen is actually taking advantage of a vulnerability in the game, as you are taking advantage of the fact that you can "change the name of the player" in notepad (in the source code). That is considered exploiting, and you will probably get your licence to play the game terminated, along with other penalties.
So if you don't want to get into any legal trouble, I suggest you assume that it is illegal to play splitscreen on Minecraft Java Edition with friends.