As for the first, It’s the same as someone uploading a stolen photo with a CC0 license, i. e. none. If the true owner finds you, they are highly likely to be entitled to get their property back.
As for criminal charges, a reasonable assumption of permission should usually work as an excuse. This will depend on the specifics, such as the item’s value, local customs, etc.
I actually found a rather valuable chair (the rietvelt) on the street, and did leave my phone number because I could not quite believe my luck. The previous owner called and told me to enjoy it.
As for the first, It’s the same as someone uploading a stolen photo with a CC0 license, i. e. none. If the true owner finds you, they are highly likely to be entitled to get their property back.
As for criminal charges, a reasonable assumption of permission should usually work as an excuse. This will depend on the specifics, such as the item’s value, local customs, etc.
I actually found a rather valuable chair (the rietvelt) on the street, and did leave my phone number because I could not quite believe my luck. The previous owner called and told me to enjoy it.