Hey there! So my question is, is it legal to: - > A user gives me a website adress: www.example.com - > He approves he owns the website by uploading a file or adding something in the meta tags. - > He applies to give me the right to show his website in a iFrame. May I show it? I mean the owner has given me the rights right? What about blogs? For example a tumblr blog? He can approve me it's his tumblr by adding the meta tags. But may I show it? Is that in conflict to the tumblr "copyright" ? And to make it even more complicated: He has the tumblr blog published as www.example.com ... what then? =D Thank you very much!
An iFrame shouldn't be illegal even if you don't have permission as long as you state it is in fact an iFrame. With an iFram you embed their website, so you are just showing their content not using it aka their website still gets visited, although it is within your website. So it's more of a visual link.
Nothing has the same capabilities of rendering a separate HTML document rendered as a component of the current document. A <div> will let you have content that is rendered into its own container that can be indpendently positioned and be rendered with its own style information. However, all of that is in the context of the current document.