Green card lottery applicants must meet some eligibility requirements whether they are living in the USA or in another country. This ia according to the DV Lottery instructions published by the US State Department.

All the participants must be native of one of the country that is listed by the State Department as eligible countries. You can claim nativity by other means too. Read the dv lottery Instructions 2012.

Must have completely passed the High School certificate, which is equivalent to the U.S High school education after attending junior and high school for 12 years.
Or must have 2 years of job experience within the past 5 years after learning and train the job for a period of 2 years. Check the DV Lottery instructions for more information.

If you are a Green card lottery winner at the interview, you must proof your medical fitness according to the USA Requirements.

You must provide a clean police certificate.

Need to provide an affidavit of support from a person who is living in the USA as citizen or LPR holder (Green card).

Single unmarried person can submit only one entry.

It is not necessary to get married to participate in this lottery.

A married person must include his/her spouse.

All the children who unmarried and under the age of 21. Those children who are USA citizen or LPR holders must not be included in this lottery.

Don't participate in this visa lottery, if you are banned by the US Government for life time for previous visa fraud attempt.