The latest version for Data Loss Prevention is version 9.0.
Customers who are eligible for this upgrade will receive upgrade notifications but there will be no license keys. They just need to use the same key that they have for version 8.0.
If customer has just purchased DLP 9.0 and he wants to downgrade to version 8.0, he can use the key for DLP 9.0 to version 8.0.
DLP 9.0 key is backwards compatible to 8.0.
DLP 8.0 key is forwards compatible to 9.0