I’m not sure if Jason’s copyright warning would work very well:
This font is free for personal and corporate use and may be redistributed in this unmodified form on your Web site. I would ask that you not modify and then redistribute this font…although you may modify it for your own
Back in my pre-press days, I discovered that a font becomes your design if you trivially modify just 5 glyphs. It’s an artefact of the early type producers lobbying to be able to rip each other off … not something that happens much in these DRM-obsessed days.