A number of earlier discussions on the uprightness of cards in the Marseille have taken place - but perhaps a thread which also more specifically looks at this is
How to tell the uprightness of Marseille pips.
Personally, I would not place too much emphasis on either the copyright imprint or the BN imprint on the cards. As an example, I have various editions of the Grimaud Marseille - and there
differences as to which side the copyright falls with certain cards. In any case, it reflects the views, at most, of the printer.
One of the most important indications is that given by ihcoyc: have a look at the floral imagery within the card. Often (but not always), it is specific enough to give a clear indication as to which is upright. For example (and only as an example), the uprightness of the Ace of Swords cannot be mistaken on two counts - the crown... but also, importantly, the branches.
For myself, and irrespective as to what some authors may say, what is important is that the image begins to speak. In a reading, it is not so much the assumed uprightness which is important, but how the imagery in the context as presented begins to 'speak'. And that can be done only by beginning to
narrate!