IP is stolen all day everyday by lots of people who most of the time don’t even realise they are doing it. Some people don’t even mind their IP being used, which in the case of memes is mostly true because the creators of memes usually want them to go viral.
At university we have to submit our assignments most of the time through a program that gives you a percentage of copyright. IP is becoming much more strictly regulated but it will never be completely monitored because it is impossible. Whenever this topic comes up I think of when you purchase music and movies off of iTunes because I know you are not allowed to copy the files and give them away but when you buy these things are other people allowed to listen/watch and enjoy it or do they have to purchase it? When does the protection of IP stop and what is too far?