I step away to have a nice vacation for 5 days and come back to this.
Simply put - Scans (not photos) of actual cards are allowed on the site - no matter the source.
Most of the time, images (not scans) of cards on manufacturer websites are mockups and NOT the actual card. (We have seen real examples of these being loaded here and there were NOWHERE near what the actual card was.) THis is why these are NOT allowed.
Additionally, by uploading an image, you're putting your reputation on the line as you are implying that you guarantee the image you're submitting is a SCAN of the CORRECT card. If it's not, you put your uploading status in jeopardy.
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 10/25/2023). I have added a large portion of my inventory to the site, and currently have trading turned off (details are in my profile). I have (finally) unearthed my 2 very large boxes of Star Company minor league sets and they are available (email for details).