It is "original works of authorship fixed in any tangible medium of expression, now known or later developed, from which they can be perceived, reproduced, or otherwise communicated, either directly or with the aid of a machine or device."

What this means is, if it documented in any way, it is copyrighted. No longer do you have to show the copyright symbol or the work copyright.

(Section 102 of the Copyright Act, "Subject matter of copyright: In general.")