I'm creating a new plugin that will place a powered-by link in posts (among other functionality). The plugin directory listing requirements state:
"The plugin must not embed external links on the public site (like a "powered by" link) without explicitly asking the user's permission."
I've searched but can't find anything further about how exactly this needs to occur. For example, is this an opt-in at download or simply a clear statement posted somewhere, and does this permission need to be stored somewhere?
I've searched everywhere but couldn't find any details. Could someone point me to more information or perhaps point out a plugin that currently does this I could review?