Can I use marketplace content outside ue4?

If I buy a marketplace asset pack that is from a third party seller and not from epic themselves then can i use them on a engine that is not ue4?

For context of this question i wish to use some content from the marketplace in a free mod for a 3rd party commercial game that was made using UE3/UDK .

But I’d also like to know what are the limitations on assets purchased from marketplace in general


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