BTW in terms of the wording, please follow something like this (linked from LEGAL-77 above): http://www.apache.org/licenses/example-NOTICE.txt. Look at the PCRE text there. You don't need to say anything about "Apache approved" license -- that's not a legal concept, it's just a term ASF uses to describe these. Otherwise people will think that the whole package might not be licensed as Apache 2, which is wrong.