The United States blazed the trail in giving copyright protection for software. Until just recently, many other countries favored sui generis protection for software, but that argument was finally settled in GATT/TRIPs and last December's World Intellectual Property Organization Copyright Treaty.
"Copyright Protection For Software,"
ILSA Journal of International & Comparative Law: Vol. 4
, Article 6.
Available at: http://nsuworks.nova.edu/ilsajournal/vol4/iss2/6