[VenTatsu]

Proof of direct copying may not be required, if AT&T can instead prove Access and Substantial Similarity.

For access it could be a little tricky, certainly every one that has posted a reply here has had access, and if this post is popular enough it could be argued anyone could or has had access (this happened in some music cases in the last few years).

For Substantial Similarity your definitely in trouble if you have exactly 3 blank lines and probably in trouble if you have 2 or 4 blank lines, but you may be fine if you have like 6 or 12 blank lines.

While I'm being a bit sarcastic about the number of lines being "substantially similar", the legal standard in the US is not if you actually copied something, but if the plaintiff can convince a judge/jury that it's more likely that you copied it than it is that you created it on your own.