Yes, Perldocs are copyrighted. The mere act of creating them means they are copyrighted. Unless the authors (or (former) copyright holders) clearly stated a work no longer has a copyright, or 75 years (number of years may vary over time, and may differ depending on the country) have passed since the author(s) died, you must assume the work is copyrighted.
Copyright != License.
Neither copyright nor any Perl license forbids you to make copies for your personal use. (Otherwise, you wouldn't even be able to install them (which makes a copy) or read them (which copies them from disk to memory - multiple times)).
Whether or not you have the intend to sell is irrelevant for copyright (although it may influence any penalties you have to pay) - it's about distribution.
Which "the website" are you talking about? The Perl tarball is authorative, not some website.