There is a couple things - I will be adding in a link at the bottom of the plugin ("powered by" type of links) - so it MUST abide by the wordpress guidelines.
The rule for links is: The plugin must not embed external links on the public site (like a "powered by" link) without explicitly asking the user's permission.
So the plugin will have to ask the users permission to add the link.
There also 4 other rules the plugin has to follow (found at: [url removed, login to view])
I would like to specifically know how you would ask the users permission to add the link as well.
Good luck bidding!