When Cisco releases free software updates, customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades. Customers without service contracts should contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.”]
Source: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170530-samba