Ça y est, après 6 mois de travail acharné, le développeur Maurice Heumann a réussi un sacré tour de force : craquer la protection Denuvo du jeu Hogwarts Legacy ! Il n’a évidemment pas fait ça pour pirater le jeu à tout va puisque son but était d’en décortiquer les mécanismes pour comprendre comment ça fonctionnait dans les entrailles de la bête Denuvo.

Du coup, il est resté assez vague sur les détails techniques pour éviter que ça parte en vrille. Mais ce que je peux vous dire, c’est que Denuvo c’est du costaud. Ce DRM utilise tout un tas d’astuces pour vérifier que vous avez bien acheté le jeu en créant une sorte « d’empreinte digitale » de votre PC. Ensuite, un petit ticket Steam est envoyé pour prouver que vous possédez bien le jeu. Ce ticket part direct sur les serveurs de Steam qui vérifient alors que tout est en règle. Une fois validé, un jeton Denuvo est généré, mais attention, il ne marche que sur le PC avec la bonne empreinte !

Et c’est pas fini puisque pendant que vous jouez, le jeu va régulièrement vérifier cette empreinte pour s’assurer que vous n’êtes pas en train de tricher. Notre ami Maurice en sa qualité de Gryffondor (ou un Serpentard , on ne sait pas trop) a donc réussi à détourner le système après des mois de reverse engineering pour identifier la plupart des vérifications d’empreinte, sans compter sur un coup de bol incroyable qui lui a permis de trouver le dernier déclencheur. Résultat des courses : avec environ 2000 rustines maison, il a pu lancer le jeu sur son laptop en utilisant un jeton généré sur son PC fixe.

Il a aussi voulu tester si Denuvo ralentissait vraiment les performances, comme beaucoup le pensent. Alors certes, il n’a pas pu faire des benchmarks dans les règles de l’art mais il a regardé à quelle fréquence Denuvo faisait ses petites vérifications.

Et surprise : les bouts de code Denuvo ne s’exécutent qu’une fois toutes les quelques secondes , ou lors des chargements. Donc pas de quoi fouetter un chat niveau performances. Ça rejoint d’ailleurs ce que Denuvo avait déclaré officiellement. Alors bien sûr, le crack de Maurice n’est pas parfait puisque le jeu plante encore de temps en temps mais son but c’était surtout d’arriver à lancer le jeu et atteindre le menu principal. L’idée une fois encore c’était de comprendre comment ce fameux DRM fonctionnait et il a réussi son coup ! Par contre, ne comptez pas sur lui pour vous donner tous les détails techniques… Un magicien sait garder ses secrets ^^.

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Enlarge / You have nothing to lose but your chains. (credit: Aurich Lawson | Getty Images)

Simply mentioning the name "Denuvo" among some gamers is pretty much guaranteed to get you an instant, strong reaction. Just look at the comment threads underneath any Ars article covering Denuvo and you'll see plenty of complaints about the DRM-enhancing anti-piracy technology.

Irdeto, the company that acquired Denuvo in a 2018 purchase , doesn't generally make a habit of commenting at length on this reputation (or its secretive DRM schemes) in the public press. So when Irdeto Chief Operating Officer of Video Games Steeve Huin agreed to defend his company publicly in an exclusive interview with Ars Technica, I jumped at the chance to talk to him.

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Most video gamers will be familiar with the concept of an end-of-level or end-of-game ‘boss’. They take many forms but tend to present as an escalated challenge designed to prevent gamers from progressing any further.

Anti-piracy company Denuvo embraces the ‘boss’ concept and drops it on its head. Anyone wanting to play a Denuvo-protected videogame without paying for it will have to defeat Denuvo’s protection right at the very beginning, before the game even starts.

Worst still, only a handful of people in the whole world are up to the Denuvo boss challenge, so until they emerge victorious, nobody gets to play the game, unless they’re prepared to pay for it. This makes Denuvo very unpopular in video game piracy circles but very popular with its clients, some of whom have a new product to consider.

Nintendo Switch Emulator Protection

Providing there’s no obvious reuse of copyrighted code or trademark abuse, emulation software is mostly immune to legal attack. Emulators that mimic gaming hardware are mostly legal to develop, legal to distribute, legal to own, and even legal to use.

In reality, most emulator gamers like to gloss over that last bit. In the time it takes the minority to shout “HOMEBREW”, the rest will have downloaded several hundred MAME ROMs, a few Nintendo Switch games, and will be playing them on a PC.

Nintendo is concerned about all piracy, but emulator piracy is special in that gamers don’t need to buy games, and they don’t need to buy a console either. Denuvo announced today that it has a new product to bring this to an end.

It’s called Nintendo Switch Emulator Protection and Denuvo wants game developers to start using it right away.

Emulation Good / Piracy Bad

Reinhard Blaukovitsch is the founder and Managing Director of Denuvo, a business owned by cybersecurity giant Irdeto. In an announcement on Irdeto’s blog today, Blaukovitsch acknowledges that PC emulators can bring old games back to life with a wave of nostalgia but warns of the piracy risks.

The claim that hundreds of free emulators can play Switch games sounds a bit enthusiastic, but that’s not really important. Yuzu and Ryujinx are the most popular and between them cover Windows, Linux and macOS users. All three can be used with entirely legal software but Denuvo would like them to be less useful to pirates moving forward.

Games Need Protection From Emulation

“Your Nintendo Switch games need a protective solution. Emulating games may be harmless in some cases, but at the end of the day, it is still a major means of piracy,” Denuvo’s message to Nintendo developers reads.

“Our brand new Denuvo Nintendo Switch Protection helps prevent emulation from the get-go and stops pirates from getting hold of your game via the PC.”

Denuvo says its solution integrates “seamlessly and automatically” and works by detecting differences in the way a game behaves compared to what it was designed for.

“In this way, our software can tell that your game has been tampered with – and will make it unplayable.”

Denuvo says its solution will stop Switch games from being pirated and help to secure income for developers. As for gamers, they will “simply have to pay” if they want in on the action.

The Switch hacking/piracy scene is likely to perceive that as a challenge.

From: TF , for the latest news on copyright battles, piracy and more.