Prepaid royalties represent payments made for the purchase of non-transferable, non-exclusive patent rights associated with a patent license. The patent license allows for development of current and future products in our digital line of periscopes. We completed our first international shipment utilizing this technology in 2014 and are currently in production to support a U.S. Government Foreign Military Sale contract awarded in January 2016. We estimate the commercial life of the patent at seven years. As of December 27, 2015, the balance of the patent license is $112.8 thousand net of accumulated amortization. The royalty expenses for the associated patent license are amortized on a straight line basis starting in fiscal year 2013. The amortized royalty expense for the three months ending December 27, 2015 and December 28, 2014 was $7.5 thousand, respectively.