Further to Mani's reply, if Backup Exec is already installed then following technotes will help you to locate the licenses installed on Backup Exec v8.x and v9.x
1.) http://seer.support.veritas.com/docs/256072.htm
2.) Refer to the following technote to create the BEDIAG.FAX file
http://seer.support.veritas.com/docs/251970.htm
- Then, refer to the step-3 of following technote:
http://seer.support.veritas.com/docs/231882.htm