Smarty wrote:
As grandparents, my wife and I do frequent toddler babysitting.

The kitchen cabinets, drawers, and other compartments are very tempting
for our grand-daughter to investigate. We are looking for a way to keep
this closed and inaccessible to a young child, while still allowing
adults to easily open and close the doors and drawers.

Unlike 30 years ago when our own children were toddlers, we now have
very high quality custom cabinetry and drawers, and do NOT want to
drill or attach any fasteners which deface or damage the cabinets /
doors. The fasteners were used 30 years ago required drilling holes
into both the doors and the cabinets in order to attach the plastic
latches. This is NOT an option for our current cabinets.

Does anybody know of any device or fastener or method which provides a
secure and reliable latch to children, easy access to adults, and easy
removal without leaving any permanent damage to the custom cabinetry?

Thanks in advance for your assistance and suggestions.

There are plenty of childproof gagets for cabinet doors that are mounted
on the inside of the cabinet and will leave no holes or damage that you
can see, unless you stick your head inside the cabinet. Just google
childproof cabinets and you will probably get a few thousand hits.