N'ọnwa Jenụwarị afọ 1998, Netscape wepụtara koodu isi nke Netscape Communicator 4.0 n'olileanya na ọ ga-aghọ ihe a na-ewu ewu na-emeghe. O tinyere koodu a n'okpuru Netscape Public License, nke yiri GNU General Public License ma kwere ka Netscape nọgide na-ebipụta ọrụ nwebiisinka nke nwere koodu a na-ebipụta n'ihu ọha. Otú ọ dị, mgbe ọ tọhapụsịrị koodu Communicator 4.0 n'ụzọ a, Netscape gara n'ihu na-arụ ọrụ na Communicator 4.5 nke a na-elekwasị anya n'imeziwanye ozi ịntanetị na ọrụ ụlọ ọrụ. N'ikpeazụ, ọ bịara doo anya na ihe nchọgharị Communicator 4.0 siri ike ịzụlite, na mmepe nke mepere emepe kwụsịrị na koodu a. Kama nke ahụ, mmepe mepere emepe gbanwere na ihe nchọgharị ọgbọ na-esote nke e wuru site na ọkọlọtọ.
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