Nowadays there are many documents that are legally and legitimately published, but still contain confidential markings.
This may be because someone forgot to remove them, or to publish the exact same document, or to save time and money, or for other reasons.
- ARM talk on WSI at XDC 2019
- The manufacturer product page for the pcDuino : still has confidential markings on their OS installation manual
- SGH-i317 / SGH-i317M / SGH-T889 https://fcc.report/FCC-ID/A3LSGHT889/1797529.pdf
- GT-I9300 http://forum.gsmhosting.com/vbb/12384381-post16.html