This might be getting at the same issue that was discussed on RAT-212 [1]. I recently replaced http URLs with https URLs on the Apache POI website, changing a couple of the website source file headers from http://www.apache.org/licenses/LICENSE-2.0 to https://www.apache.org/licenses/LICENSE-2.0
RAT caught [2] this change [3], reporting that these files had "Unknown Licenses". I reverted this change in another commit [4], but was wonder if RAT would be willing to add an https variant of the ASL header. It probably makes sense to start a discussion with the Apache Licensing/Legal team to see if they would approve this 1-character modification to their license statement and start promoting the https version. [1] https://issues.apache.org/jira/browse/RAT-212 [2] https://builds.apache.org/job/POI/1451/console#ant-target-13 [3] https://svn.apache.org/viewvc/poi/site/src/documentation/content/xdocs/book.xml?r1=1752761&r2=1752760&pathrev=1752761&diff_format=f [4] https://svn.apache.org/viewvc?view=revision&revision=1752809
