it used to be relatively easy to remove unwanted credit links from plugins. you'd open the correct file and control+F for 'powered by' or 'http://www.pluginwebsite.com' and strip it out
I could even find when this was obfuscated through layers of php code.
now it seems that newer plugin developers have found some sort of way to completely hide all trace of their credit link in the plugin files. i think someone should step up and explain the trick.
i'm okay with giving credit when appropriate, but in certain situation i cant, like where i have a landing page and i dont want any external links for people to leave as that defeats the purpose of a landing page.
come'on Cohagen! Give these people air!!