I don't think there is a problem there. Look at the first statement you quoted. It explains why (to promote ...) and then it explains what is to be done (securi

I don't think there is a problem there. Look at the first statement you quoted. It explains why (to promote ...) and then it explains what is to be done (securing for limited times ...). Protecting and rewarding authors may be a result of the "securing" part, but it is not listed as a motivation for it.