DLP is not affected by the Heartbleed flaw.
See the KB article Are Symantec Data Loss Prevention (DLP) releases affected by the “Heartbleed” OpenSSL vulnerability (CVE-2014-0160)?
https://kb-vontu.altiris.com/display/1n/kb/article.asp?aid=56728
From the article:
"Symantec Data Loss Prevention (DLP) releases are NOT affected, as these do not use OpenSSL versions that are susceptible to this defect."