Does it exist an easy to read "chart", that shows what features in an IOS you are entitled to free of cost, when upgrading?
An example: A customer ask me to forward a new version of their base image, only this time with K9 feature added. Where can i check if they are entitled to this, without purchasing a new license?
This is straightforward - feature upgrades are always chargeable. (i.e. moving from an "IP BASE" feature set to an "ADVANCED SECURITY" feature set.)
Version upgrades might be chargeable depending on whether the customer has a valid SMARTnet contract or not. (Without SMARTnet the customer would even have to pay for a version upgrade of the same feature set).
As there are literally thousands of features within IOS it's not feasible to have everthing in a nice easy-to-read table, which is why Cisco have a tool called "feature navigator" to help you find where particular features can be found, or what features are contained within a specific image.
There's a good SMARTnet Q&A here:
And the feature navigator is here:
In your particular case the customer would have to buy the IOS, and probably also buy a SMARTnet contract for it if they wanted to have any version upgrades in the future. Every IOS has a list of features associated with it - if you want to increase the feature set then you need to pay for it.