Gottfried's Omni-opening Grimoire

"The Defensive Regulatory Magicon (or DRM for short) belongs to the above-mentioned group of the longest-lasting, most effective and hardest to break defensive mechanisms. In order to recognize the individual administering it, it makes use of a portal mounted at the entrance of the area is it to defend. This portal passes streams of magical energy through the body of the person entering and can, in the blink of an eye, determine if this person has the corporeal signature (eyeball structure included) of the entitled administrator. As a result, the only unauthorized that an possibly hop to enter are mimics.

''DRM thus makes for an extremely effective and near-unbreakable security measure - but you care in luck, for you hold in your hands the key to bypassing it, namely the present tome, Gottfried;s Omni-opening Grimoire, or GOG for short. In the pages to follow you will find innumerable methods for deactivating DRM, or, even better, bypassing it altogether. (...)"''