EurLex-2 en 61 As to the remainder, in so far as the arguments set out in paragraphs 50 to 52 of the present judgment allege an error of law with regard to the assessment of the question whether MasterCard is an association of undertakings, it should be noted that, contrary to the Commission’s contention, the appellants are not, in essence, merely challenging the assessment of the facts made at first instance, but are relying, for the main part, on questions of law which are admissible at the appeal stage. EurLex-2 en 76 The applicants in the main proceedings argue that the legislation at issue in those proceedings, by increasing dramatically the amount of gambling taxes levied on the operation of slot machines in amusement arcades, while providing for the transition to an operating system based on a central server, then by prohibiting the operation of those machines outside casinos, without an appropriate transitional period or compensation for the operators concerned, infringes the principles of legal certainty and the protection of legitimate expectations.

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