Yes, the law allows only one entry by or for each person during each registration period. Individuals for whom more than one entry is submitted will be disqualified.
The Department of State will employ sophisticated technology and other means to identify individuals who submit multiple entries during the registration period.
People submitting more than one entry will be disqualified and an electronic record will be permanently maintained by the Department of State.
Individuals may apply for the program each year during the regular registration period.
However do remember that your spouse can apply separately so you have one application each doubling your chance of winning.