It is because I used some smaller bleuprints from others. But back in the time I ever joined a server whit a lot of my bleuprints so is it okay to use them inside the world (it are just tables and ends) or do I need to replace them in my own tables and ends?
i would replace them if you can, since sharing blueprints you didn't make is against the rules, or at the very least put up signs by them that say who made them if not you. (and for the record 'i didn't make this' is not credit, you HAVE to include the person's actual username so people could search it and find them in the forums)
i'm also not sure where would be appropriate to share a world file rather than a large blueprint file. what do you want to share the world for? technically there's no limit on blueprint size, so if you just want to share some things you made, even if it's a rather sizable area, you could just do that. or if you want to share the world generation, just a seed and some screenshots would be fine. i would ask red51 specifically about sharing whole world files tho.