You need to contact your local Symantec Partner for this, licenses are not available through any other means.
@wangdq - there is a 'Partner' badge next to your name?
Depending on your Partner status with Symantec, you can apply for demo or NFR keys on PartnerNet.
Your other option is to contact your local Symantec SE.
Supporting Storage Foundation and VCS on Unix and Windows as well as NetBackup on Unix and Windows
Handy NBU Links
Opps, missed the partner badge, thanks Marianne ...