Markets also play a key role as spaces for cultivating and transmitting the Mediterranean diet during the daily practice of exchange, agreement and mutual respect.

UNESCO: Mediterranean diet

As you can see in the screen shot below (from the Ars Technica article), you can provide links to your files (either containing the key so someone can access them directly or by providing them with the key separately) but you are prompted with a caution about not transmitting the keys through insecure channels and a far-reaching copyright warning.

FORBES: Kim Dotcom's New MEGA Encrypted Cloud Storage: See No Evil, Store No Evil