There are many types of product photography. The most common is the one that shows an object on a white background.
In The Netherlands some judge at one time has decided that copyright laws are not applicable for pictures of objects on a white background (!)
Probably he decided on this in order to avoid situations in which the photographer could revoke his permission to use his pictures of products that were used in a webshop of a customer of the photographer. This could result in a sudden bankruptcy of that company, because they would then no longer be able to use any picture in their webshop and basically could not sell any product anymore. This is of course undesirable and is a good example of why copyright is wrong at large.
Whatever a judge has decided, we would have given up copyright on all our pictures anyway, because we think the world would be a better place without it.