It’s called Premium to separate it from the free products offered by other vendors. With Comodo they give out all of the protection modules for free. The paid products include extras such as TrustConnect, Online Backup, GeekBuddy, etc… However, the protection is the same for all versions, free or paid.
I have burned before by digital security products that purport to be free but are just free to download. To use the programs you have to send money, usually after a short interval
What section of this board should I post a request for advice on how to safely remove all traces of avg security products from my computer