I've had nothing but trouble getting various programs like Adobe Audition etc. to save Title, Author, Composer, Copyright info with a song, so I was delighted to find a program which is free and allows you to "label" a whole list of songs with relevant information.
Go here to download (Windows) Tigo Tago which works like a spreadsheet.
You need to have either Netframe 1.1 or 2.0 to load Tigo Tago.
http://tigotago.com/I tested a lot of programs free, or otherwise, and many (including Audition) do not have a copyright text slot.
For Tigo Tago, choose the Advanced Editing and you will find the Copyright field. After you use it on one of your songs, be sure to check with one or more media players to see if all of your information shows up.
Hope everyone finds this helpful.
Thanks for this great site!
Dan