I was just about to post my own version of this comment when I saw this one!
I know the old answer to this question - if you read the ZW help file it contains a link to the CCLI website stating what the required text is on all reproductions of songs that are made. I know this is the answer to the question, as I and others have asked the question before (
http://www.zionworx.org.uk/forum_3/viewtopic.php?f=20&t=763&p=3384&hilit=copyright#p3384 and
http://www.zionworx.org.uk/forum_3/viewtopic.php?f=1&t=243&hilit=copyright).
The problem is that the link in the help file is now out of date. The most recent document from CCLI that I received says "Under the lyrics of each song reproduced, you must include: [author], © [year,owner] [your licence number]" - see
http://www.ccli.co.uk/licences/churches_reproducing-song-words.cfm. Therefore, as "Words and Music" is technically incorrect for lots of songs - and we are not reproducing the music in Zionworx, nor might the church have a licence for the reproduction of the music, Zionworx should change to read the current CCLI wording.