I'm almost positive you can use Asset Store purchases in UE4. The first clause of "only for intended purposes" is basically a legalese sentence that is clarified in the next sentence, telling you what the intended purpose is. Someone can't sell something on the asset store and then say "The intended purpose is for you to burn it to a cd and then eat it, and if you do anything else with it I'll sue you." Unity sets the terms of what the intended purpose is for exactly that reason, and the intended purpose is clarified in the next clause. FYI that clause is:

"perpetual license to the Asset to integrate Assets only as incorporated and embedded components of electronic games and interactive media and distribute such electronic game and interactive media"

There's nothing saying you have to use Unity for your game. As long as it's a game, you can use whatever engine you want. I'd also say that the fact that they never specifically demand that you use Unity in the EULA is on purpose; they don't want purchasers to feel like any art or sound they buy would be unusable when developing outside of Unity.

Licensor grants to the END-USER a non-exclusive, worldwide, and perpetual license to the Asset to integrate Assets only as incorporated and embedded components of electronic games and interactive media and distribute such electronic game and interactive media. Except for game services software development kits (“Services SDKs”), END-USERS may modify Assets. END-USER may otherwise not reproduce, distribute, sublicense, rent, lease or lend the Assets. It is emphasized that the END-USERS shall not be entitled to distribute or transfer in any way (including, without, limitation by way of sublicense) the Assets in any other way than as integrated components of electronic games and interactive media. Without limitation of the foregoing it is emphasized that END-USER shall not be entitled to share the costs related to purchasing an Asset and then let any third party that has contributed to such purchase use such Asset (forum pooling).


The EULA is pretty clear. You are free to embed and distribute them within any "electronic games and interactive media". Unity already takes it cut when you buy them. They would obviously prefer you use them in Unity, but nowhere it the EULA is that mentioned at all. The Unity's Asset Store is separate from their engine.

There is nothing unclear about "worldwide" and "perpetual". You aren't licensed to use the assets in space, I suppose.

Editor Extensions have their own clause, but you aren't going to be doing much with those in any other game engine anyway.





So you do need to ask each asset author what the individual terms are, yes. Unity does a lot of protecting for the little guy in this respect but Unity can't protect you elsewhere.


Why would this be the case? Terms are agreed to and payment was rendered. There's nothing more you need to ask each individual author.