When using links is legal?

The issue whether usage of links to access of content in Internet infringes copyright rights has become extremely fashionable nowadays having regard to several European Court rulings on the matter in particular Case C-466/12 Svensson and Case C-348/13 BestWater.
The famous blogger and professor Eleonora Rosati published a handy table that illustrates when the use of the link is legitimate and when can create problems with copyright.
More information can be found here.