In previous versions of Coppermine the "Powered by Coppermine" used to be obfuscated to make it hard for non-coders to remove the tag. The reason behind this was an additional license add-on that disallowed users to change the line. The dev team has reviewed this policy for cpg1.5.x and decided that end users are allowed to change or remove the line in legal terms - for details, please review the Copyright & Disclaimer-section of the documentation.
Before removing the credits, please consider this as well: Coppermine is free software, the dev team asks you to keep the footer intact. We're convinced that you should give credit where credit is due. Additionally, the footer is meant to spread the word about Coppermine, with the "Powered by Coppermine"-tag giving others the opportunity to get a gallery of their own. So please think twice before you decide to remove the tag.
This being said, this is how you can change the tag: to edit the place where the tag is being displayed, edit themes/yourtheme/template.html and move the placeholder {CREDITS} around. If you remove it from themes/yourtheme/template.html, the original default tag will show through. As it is being generated by Coppermine's pagefooter function, it needs to appear below the {GALLERY}-token. To change the content of the disclaimer, edit themes/yourtheme/theme.php and edit the function theme_credits as you see fit. If this function doesn't exist in your custom theme, copy it from the sample theme into your custom theme first. To actually remove the "Powered by Coppermine"-footer completely from the output, just modify that function to output nothing.
Instead of removing reference to the Coppermine web page completely, we encourage you to edit the function in your custom theme and add the information you would like to see. Here are some examples for the output of what the Coppermine dev team considers to be fair use:
Of course a mixture between all those examples would be OK as well.
It may sound amazing to most, as the rules explained above should be quite reasonable and easy to understand and respect. However, in the past there have been third parties who tried to re-brand Coppermine: particularly a German website tried to build a community by offering the Coppermine package for download with only a tiny little detail changed in comparison to the original package: the "Powered by Coppermine" tag at the bottom no longer pointed to the official Coppermine website (coppermine-gallery.net), but to the website of the wannabe-community-builders. We leave it to the judgement of the web community wether this was legitimate or not.
This section of the documentation is not aimed at end users, but at those who want to re-bundle, distribute, re-brand or modify coppermine in any other way and make the modifications available to others.
With this in mind, here's a clarification what the Coppermine dev team considers to be unfair use:
Notice the difference between fair and unfair use: end users (i.e. owners of a particular gallery on a web page) are allowed to modify the credits line to make their visitors aware about copyrights, ownership etc. Re-distributing Coppermine (porting) is allowed and encouraged as well, but the edit of the credits needs to be justified by the amount of work spent for the port, and the edit must not be meant to confuse the recipients of the modification about the origin of the core code.
For those who plan to re-distribute a modified copy of Coppermine: please read the license section as well for details on the preservation of author attributions within the code: while it's allowed to remove the "Powered by Coppermine" tag from being being displayed in the output generated by Coppermine-driven sites, it's mandatory to preserve the credits within the code, even if you're redistributing Coppermine in a modified manner. However, it's important to make others aware that your modified "flavor" of Coppermine differs from the original, so please read up Marking of modified versions as well