From the Washington State University website- FAQ
"In the 1930s the Creamery became interested in different ways to store cheese. Cans seemed the best option as plastic packaging materials had not been invented and wax packaging sometimes cracked., leading to contamination.
Cougar cheeses should be stored under refrigeration....may be transported at temperatures under 70F and should be refrigerated upon arrival.
Once opened do NOT store the cheese in the can as the opened lip will rust and/or a black film will develop....
Remove cheese from the can and store in an airtight container. ...recommend cutting into smaller pieces and individually wrapping in plastic wrap.
...freezing endangers the quality. ....left out of refrigeration too long....most likely there will be a change in the texture of the cheese and moisture (whey) may be forced out of the cheese.

As long as the cheese is unopened and refrigerated it will last indefinitely. An unopened can of cheese becomes more flavorful, sharp, dry and crumbly with age.
Smoked cheese will become bitter....
"We know of customers who have stored their Cougar Gold for over 30 years."

http://creamery.wsu.edu/cougar-cheese/faqs/
(A lot more there.