There are different kinds of encryption possible.
Most encryptions are just visual encryptions, like VRC cars since forever. You can unpack and edit the data.acd, but cannot edit any graphical components of the car (ignoring ext config)
Some (very stupidly) are both visual and physics encrypted. Can't edit anything, if you delete data.acd then you'll get the model as a bunch of blue triangles
Very few I know (mainly ier p13c and bk audi gt3) are .ini encrypted, meaning you can't actually see nor edit the specific .ini files too. Those cases are because they use confidential irl data which is understandable.
RSS have been doing visual encryption since the F1 2013 came out, i think they were upset people were stealing their model or smth like that