Hi,
this will depend upon the type of product (channel) you purchased, and the Use-Rights of the purchased product.
e.g.
did you purchase a "Product Key Card" product, through an online store or at a retail store?
did you purchase a "Retail" product, through an online store or at a retail store?
did you purchase through a Volume Licensing agreement via a Reseller?
In each case, the Use-Rights are different.
There should be a Product Use Rights (PUR) or Microsoft Software Licensing Terms (MSLT) or End User License Agreement (EULA) document, which explains how you may use your specific purchase.
Don