If you have questions or are troubleshooting issues with licensing Symantec App Center, you may want to check out the Enterprise Support Solution document on licensing.
Enterprise Support Solution topics compile all of the content that you need to learn about, use, and troubleshoot a specific Symantec App Center feature in one convenient place. It provides abstracts so you know what the content contains and it provides links to the content.
http://www.symantec.com/docs/HOWTO84947
There's also a video on licensing Symantec App Center that may help.
https://www-secure.symantec.com/connect/videos/licensing-your-symantec-app-center