Do you know how html works? Normal browser * Have link to content, say blah.html * Download blah.html * Parse blah.html, * extract links to css, js, images, flash ... * Download from extracted links * Display

Instapaper * Have link blah.html * Download blah.html * Don't parse, don't worry about any built-in links * Display

Now realize this has NOTHING to do with a derived work or copyright infringement. I'm merely choosing not to download and display some parts of published content, saving bandwidth which I'm paying for!