Need I connect to a server to do the checks?

SDL AuthorAssistant is a client software application. It performs checks based on the rules you specify in the SDL AuthorAssistant Configuration dialog box (SDL AuthorAssistant > Configure). You can reuse the same configuration later by saving the rules as a profile (.pfl file) on your computer. You can also import and use a profile created elsewhere.

So, if you have configured SDL AuthorAssistant or use a profile stored locally (either by creating or importing), you can check your documents without connecting to a server.

However, if you prefer to create and manage profiles centrally, you need an authoring management system for the server from SDL. For details, contact SDL.

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