Typically, professional OPL competitions should be run with open decklists, but it is ultimately up to the discretion of the head judge regardless of the event level.
§ 401.5.b Tournament Rules PDF (officieel)
§ 401 Deck Registration
§ 401.5 Other player’s decklists are normally considered private information. The head judge of an event may run that event or the final rounds of that event using an open decklist policy. In this case, all players’ decklists will be considered public information.
