I have a legal question.
My company is using the Atlassian confluence open source license. I want to know if there are legal or community aspects which prevent me from removing the "Powered by Atlassian Confluence 4.2.2, the Enterprise Wiki..." text in the footer.
In section 4.6 of the End User Agreement it explains the attribution to Atlassian is required. This is the case with all license types (commercial, academic, open source, etc). As Nic mentioned, you can modify the text to a certain extent, like removing the name Confluence or the version number, but the "Powered by Atlassian" with a hyperlink to www.atlassian.com must remain.
I hope this explains.
Your licence agreement explicitly stops you from removing the "Powered by xxx" and the link. You can move it around, format it differently and remove/reword a lot of the footer, but you *must* retain that one part of it, visible, readable and clickable.
I don't know if Atlassian may allow you to remove it for certain cases if you talk to them directly though - it's worth aasking them.