I learn that it will be difficult if not impossible for somebody outside U.S to obtain .edu domain, it seem they monopolize it to stay within U.S. and only for U.S. accredited Institutes.

Any body in Nairaland registered one ? I would like to know.

.edu Eligibility

Only U.S. postsecondary institutions that are institutionally accredited by an agency on the U.S. Department of Education's list of Nationally Recognized Accrediting Agencies (see recognized accrediting bodies) may obtain an Internet name in the .edu domain. These include both "Regional Institutional Accrediting Agencies" and "National Institutional and Specialized Accrediting Bodies" recognized by the U.S. Department of Education.

Note that institutional accreditation is required for .edu eligibility; program accreditation is not sufficient. Not all agencies accredit institutions. Some accredit only institutions, some accredit only programs, and others accredit both institutions and programs.

It is also important to note that, while every effort is made to keep the EDUCAUSE list up-to-date, the U.S. Department of Education's list of Nationally Recognized Accrediting Agencies and State Agencies are the only official comprehensive lists of agencies.

For postsecondary institutions located outside the U.S.: As specified by the Department of Commerce, only postsecondary "U.S. institutions" that are institutionally accredited by one of the agencies on the U.S. Department of Education’s list of Nationally Recognized Accrediting Agencies may apply for new names in the .edu domain. We thus require applicants to be located within the United States (including U.S. territories and possessions); or to be licensed, chartered, or incorporated within the United States (including U.S. territories and possessions); or to be otherwise officially recognized by a U.S. state or federal government agency (including U.S. territories and possessions).

Source:http://www.educause.edu/

Of course .edu is strictly for the US institutions, same as .gov, and they are not the only country restricting the use of their CcTLD. Some countries allow foreign usage with a rule of having an existing in their country.