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what do I do about the credits at the top of the pages?
If you have changed the files, you can put yourself as author.
Just remember credits ("this module is based on xxx developed by yyy") in readme and xoops_version.php file.
Quote:
Am I allowed to remove it, because I'm not sure my users appreciate it.
You can throw visible credits as far as you like as long as you keep the credits in code comments/readme/xoops_version.php file, so there is no doubt what you have based your work on.
You can do whatever you want with GPL code - but if you release it, you'll need to keep the credits.
"When you can flatten entire cities at a whim, a tendency towards quiet reflection and seeing-things-from-the-other-fellow's-point-of-view is seldom necessary."
Cusix Software