FOSS alternative to Unsee.cc - eviltoast

I want to share some images securely with self destruct. Is there any alternatives can do what Unsee.cc does excluding chat?

So the functions I’m looking for:

  • Self-expiring image
  • Copy protection
  • Store in RAM
  • (optional) watermarking
  • (optional) share more types of documents like PDF

Thanks in advance.