Cactus Game Design Message Boards

Definition of "Not in battle" and "Not in Play" do not address the issue of face-down cards.

"Several Redemption® cards contain special abilities that refer to cards that are “not in battle”. Cards "not in battle" are cards found in (1) territories, (2) set aside areas, and (3) Lands of Redemption."
"In Play means within the Field of Play. Cards that are considered in play include cards in territories and cards in any main battle or side battle that hasn’t been set-aside by a special ability. Abilities that don’t specify where their targets must be located by default can only target cards in play."

Without that clarification, some long-standing rulings are not correct by a reading of the rule.  For example, face-down cards in artifact piles would be in play and 'not in battle' by the definition in the REG, when 'in play' has excluded these cards for quite a long time and in many contentious rulings while 'not in battle' had this clarification that excluded face-down cards.