🚀 go-pugleaf

We are a happy MAC family, my wife, 6 yr old daughter and 2 1/2 yr old son.
Recently, the little guy has gotten amazingly proficient at clicking on icons
and dragging them around. It is becoming a new adventure to come home from
work and see what he may ha moved, hidden or dragged into the trash. I want
to leave him his own folder to play in and then protect all of my own work.

Can anyone recommend a very simple, inexpensive folder security package ?
Maybe something that can protect a folder and all folders and files within it
with a password and leave other (the boy's folder) unprotected and
available to him to do with as his imagination dictates. I once used
Sentine but that was awkward and if I remember required a new "lockbox"
folder to be created and the files/folders to be protected to be moved into it.
All I need is to protect basically all of the hard disk with the exception of
one or two folders left un-protected. Encryption is NOT necessary.

I appreciate all of your suggestions and if there is interest I will
summarize and re-post to the net.

Thanks and regards ;

- Al