If you want to stop people from right-clicking and saving, why not just cut the image into 16 smaller images? That would also make right-clicking and saving mor

If you want to stop people from right-clicking and saving, why not just cut the image into 16 smaller images? That would also make right-clicking and saving more difficult than screen-printing, so there's no point doing anything more advanced. For even more entertainment value, you could make the pieces irregular shaped, with transparency :-)