Rubik's Cube shape is not a trademark, EU rules

The 3D brainteaser invented in 1974 by Hungarian Erno Rubik is popular among young and old, with more than 350m cubes sold worldwide

Rubik's Cube Loses Bid to Revive EU Trademark

EU court strips away Rubik's Cube trademark

General Court cancels Rubik's Cube owner's 3D EU trademark

GC7HZPY Christmas Toys – Most Popular – 1980 – Rubix Cube

Rubik's Cube loses EU trademark battle

Peculiarities of registration of shape trademarks - article Zuykov

The Rubik Cube and freeriding

EU COURT RULES ON THE SHAPE OF RUBIK'S CUBE AS A TRADEMARK

Does using the Rubik's cube for a logo break a copyright? - Quora

German company beats Rubik's Cube trademark