The credit card issuer could claim a secured interest in the debts you already ran up on the card. I've never seen a secured credit card that guaranteed to extend the credit for any set period of time; rather, all those I've seen say the card issuer may cancel the card at any time. In that case the credit card lender cannot claim that the full amount of the security deposit is at risk. The credit card company may just cancel the card if the unused security is taken by the judgement creditor and suffer no harm.

