A sandwich would only be protected by copyright if it were literally a work of art. You may trademark a sandwich (the Filet o' Fish, for example, is a registered trademark), but this can be expensive. There are also a few sandwich patents, such as the "sealed crustless sandwich" known as Uncrustables.

yes u can leave it in the freezer for 10 years! :) xx

Sandwiches should be stored in a tightly sealed container or plastic baggy in the refrigerator.

Only if it's baked in a tin with a rectangular lid, such as for "crustless" loaves. Normal loaves baked in standard loaf tins develop a domed top, making them not cuboid.

"Crustless" loaves are baked in completely sealed cuboid tins, which does mean they develop a cuboid shape. However this may be squashed slightly during packaging.

Clearly, not all bread is baked in a loaf tin - for example French baguettes, bloomers, cottage loaves etc... free-form loaves are never going to be cuboid.

what ever you want to put on a sandwich is what is on a sandwich