RepRapReadOnly
<accesscontrol>RepRapDevelopers,,anon(ro),,</accesscontrol>
You can only edit this file if your name is in Usergroup:RepRapDevelopers. Everyone should be able to read this, however.
To make other files read-only (except for RepRapDevelopers), add the line "<accesscontrol>RepRapDevelopers(ro)</accesscontrol>" to the first line of text.