The French system, appellation d’origine contrôlée (AOC), was introduced to protect winemaking regions and was based on the concept of terroir. In practice, it covered geographical areas of dramatically different sizes and with varied geographical make-up. There were also rules dictating traditional production methods for each product and the ingredients and any additives were public knowledge. A very loosely enforced system of taste-testing was also applied to wine. Once an AOC was granted it was essentially permanent – removing this classification was all but unheard of.
Although the EU system was considerably stricter and more regulated, all the French foods that had AOC at the time of the change were grandfathered in without any new checks or tests. There are very few AOC products that have been refused AOP classification, but one rare example involved Gruyère cheese, which was produced in both France and Switzerland (the latter is not in the EU, but has a trade agreement). Under the EU system, only one country can hold the AOP for a named product, so an analysis was made of who had the oldest rights to the name. The EU found in Switzerland’s favour, so although France can still make Gruyère, they cannot label it AOP.
This system is being phased out, but as there is no EU law dictating a change in labelling, the AOC classification is still in use by some producers. A mandate to switch is unlikely to be introduced until 2020 at the earliest.