> "Discovery of content" implies to me that there is some kind of search. It implies an amount of self-directed, self-motivated activity. I would think that a PhD researcher or a programmer on stack-overflow or a person in a library is "discovering content"

This confused me until I realized that you're using "discovery" like a lawyer would:

    discovery (noun)
    1. The act or an instance of discovering. 
    2. Something discovered.
    3. The compulsory disclosure to the opposing party of factual information or documents relevant to a lawsuit prior to trial.