One year, Disney (or whoever they contracted the job to) stole some artist's image of the Sanderson Sisters for that year's Halloween merch. Disney immediately pulled the merch when it came to light and it took a few weeks to put out new non-stealy merch.
The funny thing is that Disney owns the Sanderson sisters, so again, we have the chicken and the egg chasing each other.
Yes, I remember when that happened!
The merch photos were circulating and then within a day or two it was all pulled.
A few items were reportedly sold ( shirts, and MagicBands with the design ) and are now collectors items.
Disney has a history of this happening...especially over the last few years with social media becoming so dominant.
A quick image search on any platform turns up many past Company produced designs as well as some fan art efforts that are so well done they can easily be mistaken for the 'real thing'.
One can see how such things happen -
Someone in Disney's art department for Consumer Products is browsing images online and comes across a design that looks like it has potential.
They think it's authentic Disney produced artwork, and 'steal' it to use for something...merch, media, etc.
However, in reality it's actually un-official 'fan art'....and it's used with said persons involved not realizing it is.
Disney has even swiped fan art for use on in-Park signage...assuming it's their own past artwork.
Most recent case of 'fan art theft' I recall is the great 'Humprey the Bear' decibel that happened over at Disney's California Adventure a few years ago.
A fan drew a really authentic looking graphic of Humprey, and next thing he knows Disney has 'stolen' the image and created a merchandise collection with it.
It was used to launch the then freshly redesigned area formally known as Condor Flats.
They also made a sign featuring the fan drawn Humprey graphic that was used in the Park....Disney being so convinced it was pre-exsisting artwork.
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