Suspend the Encryption Process

To stop encrypting a database in the process of being encrypted, use the the suspend encrypt option of the alter database command:

alter database database_name
    suspend encryption
Related concepts
Encrypt an Existing Database
dbencryption_status
sp_helpdb
Resume the Encryption Process
Encrypt an Existing Database
Related reference
alter database for Full Database Encryption
Related information
alter database for Full Database Encryption