[rdtsc]

> I'm just confused that the rules for allowing trademarks for ordinary words and phrases don't look consistent at the surface level

Precedence in court decisions is weighted more in some places than others. US courts, from my pedestrian observation, are all into "well there is a precedent so we'll follow that". But other countries don't necessarily do that, their courts might be more eager to disregard it and do whatever they feel is appropriate in that situation. You can see it in how OpenAI reacted "The company also cited comparable trademark registrations previously granted by the EUIPO and registrations in more than 30 other countries, including the United Kingdom and Singapore" (well precedents say this and that...)

[munk-a]

Even the US does change policies every once in a while. This is a case where Open Systems was last challenged under the old rule set when it was acceptably descriptive. Since that point standards have changed and, presumably, Open Systems might now be exposed to a similar mark challenge.