The best way to ensure that your high resolution images for POD are not stolen is to first upload the artwork image to your portfolio using a low resolution image.

See FAQ:
Upload Image Size

Then for POD, use the the image replacement feature in the POD options for the artwork record and upload your highest resolution image there.

The image server for the highest resolution POD images are NOT public accessible so the only access to it is by the POD system, by our developers and by the vendor's order fulfillment queue.

See this FAQ on how to replace a POD Image:
Replace a POD Image

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