Microsoft Office 2016 and 2013, like all versions of Office and most other programs you pay for, requires that you enter a unique product key during the installation process, proving, to a point, that you own the software.
Microsoft Office 2016 na 2013, dịka nsụgharị nke Office na ọtụtụ mmemme ndị ọzọ ị na-akwụ ụgwọ, chọrọ ka i tinye akara ngwaahịa pụrụ iche n'oge usoro nhazi, gosipụta, ruo n'ókè, na ị nwere ngwanrọ ahụ.