How to Secure Asset bundle from being imported to another project

Hi

I was working on the project where we are downloading the MAP containing 3D models as an asset bundle.
So now this asset bundle will be downloaded to the Application persistent datapath.
If someone imports the asset bundle in unity then it will reveal all the 3D models which we want to prevent.

So How to protect the asset bundle from being imported to another project.

I researched the DLL method but it is a dead end.

 

This is somewhat outdated but still sums it up pretty well:

https://docs.unity3d.com/540/Documentation/Manual/protectingcontent.html