So other people have to do a bit of work (copypasting the license into the source) to exercise the permission you've granted to them (because that's what these licenses are). That doesn't invalidate your giving of said permission.
You might also want to mention the ISC license.<p><a href="http://en.wikipedia.org/wiki/ISC_license" rel="nofollow">http://en.wikipedia.org/wiki/ISC_license</a>