Can I copy that picture?

Since gathering up old historic and genealogy photos I've wondered, what photos can I copy & reprint without breaking copyright laws. I am about to do a project with these photos so I'm researching copyrights & will share with you what I have learned:

Date of Work		Term of Copyright
Published before 1923		In public domain. No Copyright (Free to copy! YAY!)
Published between 1923-1963	When published with notice or registered in the U.S.	In public domain, unless the copyright has been renewed in which case they are protected for 95 years from the copyright/publication date.
Published between 1964-1977	When published with notice or registered	Protected for 95 years.

There are additional regulations for things published after 1978, but I don't have to worry about that for the picture I plan on copying and reprinting.

More info can be found here at the Library of Congress.

Nameless Negative: Post #3 Time for School?

My posts have dropped off in the past few months because I've been busy student teaching which brings me to this question: does this "Nameless Negative" look like a school picture? The young man on the right is Burton Alexander Powell from Halifax County, NC. He only had brothers though, so this probably isn't a family photo.

Nameless Negatives: Post #2 Two Boys

Photo of two boys taken in Oxford, North Carolina (Granville county) by J.D. Brinkley. A list of North Carolina Photographers through 1910 shows that J.D. Brinkley was in operation in Oxford in the late 1800s.

Nameless Negatives: Post #1 My Favorite Unknown

As the first post in my "Nameless Negatives" collection I believe my title may need to be explained.
I have many photographs (not actually in negative form of course) from an unknown time, unknown place, and of unknown people. Hopefully sharing these photos online will either help connect me with others who can place names with the faces, or motivate me to do more digging.

Nameless Negatives: Post #1 "My Favorite Unknown"

This is one of my favorite photographs from my nameless pile. I have no clue who these people are but every time I look at the picture I feel connected. They look young, happy, and almost playful with their slight-smiled smirks. 

Possible location: Halifax County, North Carolina or somewhere in Virginia
Possible relatives (Surnames): Allen, Cawthorn, Montague (I found this in Uriel's collection which contained photographs mainly from these families)
Possible time period: don't have the slightest idea

Below is the original condition of the photograph with scratches and holes. The above image has been edited.