In your collection, when you hover over the number showing how many copies of a card you own, a pop-up displays either the phrase "trade locked" or "tradable," depending on which they are. The same feature exists in Deck Manager. However, when viewing this on cards already added to the deck, all copies are considered tradable.
The truth waits for no one. That which you refuse to see, TPCi, slips past you. The chat function was never your problem, yet through your blindness, you have made it one.