  We classify the cosemisimple Hopf algebras whose corepresentation semi-ring
is isomorphic to that of GL(2). This leads us to define a new family of Hopf
algebras which generalize the quantum similitude group of a non-degenerate
bilinear form. A detailed study of these Hopf algebras gives us an isomorphic
classification and the description of their corepresentation categories.
