Author tags are discouraged at the ASF so at least don't require them in the Checkstyle configuration. See also: http://www.apache.org/foundation/records/minutes/2004/board_minutes_2004_02_18.txt http://www.apache.org/foundation/records/minutes/2004/board_minutes_2004_09_22.txt
incubator/pdfbox/trunk/pdfbox-checkstyle.xml