Historically, customers have been using STEP file format, shrinkwrap (when all collaborators had Creo), copy geometry (top down desing) and now there is the Collapse feature that you can try. Given the three bullets above and my humble experience, pvz is good enough. Now again, someone motivated will find a way and ressource if they need to reverse engineer anything. Even when importing a pvz to Creo most of the intelligence of the model (component constraints, relations) is gone. There is little CAD vendors that offer import for pvz except PTC with Creo (i would be worried otherwise).A measured loss, but a loss none the less. Consequently inevitably there is a loss of data.

Creo View is a tesselated file format: the shape of the model is made of triangles put together with different strategies of stitching and a given lod. Creo Parametric is an application of a suite of 10 that provide collaborative solid modeling, assembly modeling, 2D orthographic views, finite element analysis, parametric modeling, sub-divisional and NURBS surface modeling, Drafting, and NC and tooling functionality for mechanical designers.It means that anyone or anything that knows about archive will be able unzip it. Anyone who is determined enough will reverse engineering anything. You need to re-assess your requirement and define how much you are ready to share. It is like in computer security, requiring a system that would be 100% secured is a pipe dream.

Creo elements viewer