

Q1: What happens to cards placed face up in the security stack by effects?
They become face-up security cards that remain revealed. Other than rules that specify face-up security cards, the rules apply in the same manner as standard security cards.
Q2: What happens upon a security check for a security card that is placed face-up?
The check is performed with the card left revealed. Other than rules for cards left revealed, the rules apply in the same manner as standard security checks.
Q3: Does a card's Security effect trigger upon a security check with that card placed face-up?
Yes, it triggers.
Q4: What happens if I shuffle a security stack that includes security cards placed face-up?
Any face-up cards are placed face down, then you shuffle the cards. After shuffling, all cards are left face-down.
Altea EX11-064 R LIBERATOR [Start of Your Main Phase] If your opponent has a Digimon, gain 1 memory. [On Play] Flip your opponent's top face-down security card face up. [Your Turn] When one of your [Cyborg] or [Machine] trait Digimon attacks, by suspending this Tamer, that Digimon may digivolve into a [Cyborg] or [Machine] trait Digimon card in the hand. For each of your opponent's face-up security cards, reduce this effect's digivolution cost by 1. --- [Security] Play this card without paying the cost.
Altea EX11-064 R LIBERATOR [Start of Your Main Phase] If your opponent has a Digimon, gain 1 memory. [On Play] Flip your opponent's top face-down security card face up. [Your Turn] When one of your [Cyborg] or [Machine] trait Digimon attacks, by suspending this Tamer, that Digimon may digivolve into a [Cyborg] or [Machine] trait Digimon card in the hand. For each of your opponent's face-up security cards, reduce this effect's digivolution cost by 1. --- [Security] Play this card without paying the cost.
Altea EX11-064 R LIBERATOR [Start of Your Main Phase] If your opponent has a Digimon, gain 1 memory. [On Play] Flip your opponent's top face-down security card face up. [Your Turn] When one of your [Cyborg] or [Machine] trait Digimon attacks, by suspending this Tamer, that Digimon may digivolve into a [Cyborg] or [Machine] trait Digimon card in the hand. For each of your opponent's face-up security cards, reduce this effect's digivolution cost by 1. --- [Security] Play this card without paying the cost.
アルテア EX11-064 R リベレイター 【自分のメインフェイズ開始時】相手のデジモンがいるなら、メモリー+1。 【登場時】相手の裏向きのセキュリティを上から1枚表向きにする。 【自分のターン】特徴に「サイボーグ型」/「マシーン型」を持つ自分のデジモンがアタックしたとき、このテイマーをレストさせることで、そのデジモンを手札の特徴に「サイボーグ型」/「マシーン型」を持つデジモンカードに進化できる。相手の表向きのセキュリティ1枚ごとに、この効果で支払う進化コスト-1。 --- 【セキュリティ】このカードをコストを支払わずに登場させる。