> It’s not selective memory. Formats such as 101, 102, etc. we’re discontinued long before I was born. > On the other hand, my grandparents had a Kodak instant

> It’s not selective memory. Formats such as 101, 102, etc. we’re discontinued long before I was born. > On the other hand, my grandparents had a Kodak instant camera instead of a Polaroid, I am in some of those pictures, and it was a proprietary format. I think I must be a lot older than you. I used 110 and 124 for years. I can tell you firsthand these were not proprietary. Regarding Kodak instant, I never even heard of it until you wrote about it. Anyone who wanted instant photos bought Polaroid. I do not know if their cartridges were proprietary since I never owned one (the photo quality was not very good compared to traditional film). Anyway, I’m glad to learn Kodak had one proprietary format. I just do not think that makes a pattern. Sony dominated this field — make the media proprietary (by patent i assume), but let anyone create devices that use the format. Make the money on selling the media. They did this countless times; I’ve often thought about compiling a list - there are several failed media formats that never became popular. I thought Sony was behind HD-DVD (the blu-ray alternative), but it looks like that was Toshiba primarily (with Sony also backing it).