Peter,
Did you ever get an answer to your question? I know that VERITAS in the past has enabled new features that they did work with previous version licenses. Unfortunately, I cannot state that to be the case with encryption because I currently am not using that option. I am surprised that this forum hasn't answered this question because I know that encryption is used in this community. I would definetly contact VERITAS for a definitive answer. If you have problems contacting your specific sales agent or perhaps you bought through a non responsive reseller then may I suggest that you try the "chat with a sales rep" hyperlink that is on the VERITAS website.