Licensing restrictions on content in demo projects

Are there any licensing restrictions on content that is included in any of the demo projects from the Unreal Marketplace?

I’d like to use some of the spark and smoke effects from the Infiltrator demo in a personal project.

As long as they are being used within the Unreal Engine you are fine, if I remember correctly. There are many, many people that have used the assets from the Demos in their own projects. Now if you were to export the models, particles, etc into Unity or Cry Engine then there would be legal issues.