OK Dinghy sails built after Dec 31 2015 are required to have an official OKDIA Sail Label. Sail labels shall be purchased and attached by the sail maker and shall be attached near the tack and shall be sown across.
The measurer should signed and date the sail across the label. The label itself is not proof of measurement.
Orders should be sent to firstname.lastname@example.org
The cost per label is £10 including shipping.
The Class Rules change is on the World Sailing website here: http://www.sailing.org/classesandequipment/20283.php