Yes, I grab most of those files from RACK, few from eab ftp because it was more actual, and from PPA, Aminet sites. Some demos were shared in magazines, some were exclusive done for only one magazine and other ones were made by game authors and share on BBS or elsewhere. Usually those demos got altered title screen with information from what magazine they come from.
I am only interested with demos that are somehow different from final resales, got levels made specifically for demonstration purposes or got some early stuff that were cut from finished product.
I congrats DamienD for his work on this
for me it was fine because it was working, but he made it more "professional". I understand that there could be additional information about source magazine, but it was not that much important for me since usually in game those stuff were displayed or at winuae screen shoot.