This excerpt taken from the NKE 10-K filed Jul 27, 2009.
Exchange Control Information. If the Optionee remits funds out of Korea to pay the purchase price, the remittance of funds must be confirmed by a foreign exchange bank in Korea. The Optionee should submit the following supporting documents evidencing the nature of the remittance to the bank together with the confirmation application: (i) the Agreement; (ii) the Plan; and (iii) his or her certificate of employment. This confirmation is not necessary if the Optionee pays the purchase price through any form of payment whereby some or all of the shares purchased upon exercise of the Option are sold to pay the purchase price, because in this case there is no remittance of funds out of Korea.
If the Optionee realizes US$500,000 or more from the sale of shares, he or she must repatriate the proceeds to Korea within eighteen (18) months of the sale.