We scale your images down so it is not exactly possible to blow them up to a printable size for profit or personal use. Without the source image, in high resolution format, it is near impossible to recreate the image in a high enough quality to print it for display.
All artists who post their work on the web face this concern. Another option is to add a watermark over your image before uploading it.
Tags: artist, artwork, concerns, image, images, photo, photograph, plagiarism, print, upload, use, watermark