“The Act No. 42 of 1999 had a commencement date. The learned Counsel for the Respondent submits, on authority of Ojokolobo v. Alamu (1987) 2 N.S.C.C 991, and I agree, that where in a statute a commencement date is provided the presumption that the statute has retrospective effect is displaced.” 

PER E. EKO, J.S.C. in Adeokin Records & Anor V Musical Copyright Society Of Nigeria (Ltd/Gte)  LER [2018]SC.336/2008 https://legalpediaonline.com/adeokin-records-anor-v-musical-copyright-society-of-nigeria-ltd-gte/