These rules can be different between the different languages of the game. The main reason for those adjustments is because those cards are excessively used by many fighters, promoting less variety in decks.
These are the different levels of restrictions that can be placed on cards:
: A deck may include only one set of cards (by name) that are under this restriction. For example, if both card A and card B are under Choice Restriction, you may have four copies of card A and zero copies of card B, but you cannot have three copies of card A and one copy of card B.
: A deck may only have up to one single copy of this card.
: A deck may only have up to two copies of this card.
: You cannot choose this card as your first vanguard at the beginning of the fight, but a deck is not restricted in the number of copies of this card that may be included.
: A deck cannot include this card at all.
: The card was formerly part of the Card Restrictions but is no longer restricted.
: The card has two of the mentioned restrictions simultaneously.