End user license agreements
TL;DR
You are bound by the EULA of the store where you purchase the work.
Unity Asset Store
& Infinity PBR
For purchases made on the Unity Asset Store or vouchers redeemed at the Unity Asset Store (even if purchased elsewhere), you are bound by the Unity Asset Store EULA and Terms of Service.
For users who previously purchased licenses directly from Infinity PBR, your purchase is bound by the Unity Asset Store EULA.
Unreal Marketplace
Purchases made on the Unreal Marketplace, or vouchers redeemed at the Marketplace are bound by the Unreal EULA, which is linked on this FAQ page.
Please note, due to distribution restrictions, licenses purchased on the Unreal Marketplace will only include the content served from the Unreal Marketplace — license will not include the additional “bonus” content.
Unreal users can purchase from the Unity Asset Store and download the Unreal project files there. Learn more here.
Other stores
If you purchase a license at other stores, you are bound by the EULA of those specific stores.