Hi,i'm Giampy TPG. I recently made an SRB replica that became very famous. today a strange dude copied him and now it's on firts page!!!! please can you make something that could block other users to copy the creations????
Only thing you can do is report the save as stolen, and have the mods remove it.
This idea has been talked about for a while and consensus remains that actively preventing saves from being re-saved is a can of worms, a wasted effort. It's bad morale and besides, anyone can just clone the game's source code, skip the commits that introduced the save 'protection', and make their own build that doesn't protect saves!
tl;dr You'll have more luck getting moving solids to work.
Next time, don't comment or tag stolen saves. It's just annoying because I have to go and delete it. Simply use the Report button and give a link to your save (give the id, it turns into a link when I view it).
And as boxmein said, it's not worth it to block people from copying others. For one, it's easily avoided through things like stamps (unless we even block those too which would get annoying), also some people want their saves copied.