I've noticed that there's a few posts of material which is already available on other sites. I don't mean where people have edited a worksheet, but an entire pdf of material. Wouldn't it be better for posters to just give the link & a description? Surely it'd save on storage.

And are there any guidelines about posting other people's work? Like when people just post a bogglesworld worksheet? Or something that's already on here (usually with no credit to the original creator)?