For the drider characters that were approved in the past, the following applies:
Ne'kalsaider characters may be reactivated and played.
Waelinider characters must be remade into Ne'kalsaider and their backgrounds changed accordingly. The character must then be posted to the Registration thread for review as if it were a new character.
I believe Streekaider were never allowed, but even if they were they are no longer allowed at all.