Encypt a columnm (XData/Aurelius)

I coming back to developing apps after 15 years not doing them. Today is GDPR must taken serious when developing apps where data is stored in cloud. If i have understand right, all data related to persons should be encrypted at database. I haven't yet tried to use Decrypt/Encrypt function yet, but i guess data is stored at db encrypted when using them.

Been thinking situation in future where i have database full of encrypted data where encryption is made with XData encrypt function. Can i decrypt data without XData?