Hi,
Thank you for posting in Symantec community.
I would be glad to answer your query.
I hope you are talking about Symantec Endpoint Protection (SEP).
After the trialware license expires, you must activate a paid license to retain full product functionality. You do not have to uninstall the trial-licensed version to convert your Symantec Endpoint Protection installation to a fully licensed installation.
The trialware license expires 60 days after you install the product.
About the trialware license
http://www.symantec.com/docs/HOWTO55075
Download - Symantec Endpoint Protection 12 Trialware
https://www4.symantec.com/Vrt/offer?a_id=117135
Download - Symantec Endpoint Protection Small Business Edition Trialware
https://www4.symantec.com/Vrt/offer?a_id=77956