Taking a photograph of something that you own and posting it would not violate any copyright (for example, I can photograph an open book to show the condition of the book, say in the case of me trying to sell it)
To photocopy or scan a page from the book and posting it would constitute copyright infringement because you "copied" it without permission. Same would be true if you sat down and *typed* in the entire page.
In many/most cases the owners will ignore any such use that doesn't involve profit making and so long as credit is given (eg: "the following text/page/image is from page such and such of {title of book} published by so and so, etc. yatta, yatta"), *and* you had a valid reason for posting it. (eg: "i'd like to post this book for y'all to read for free, here is page 1" doesn't cut it, but "to answer your question, i reference this page from such and such a book, etc" does work)
So, if you wanted to photo a rocket kit, no problem. photocopying or scanning the cover art and posting it would be.
It is also important to note that many think that it is not copyright infringement unless the person is doing it for profit. *NOT* true. If I copy a CD (for example) and sell it, there is clear copyright infringement. If I copy a CD and *give* it away, there is STILL clear copyright infringement. In the eyes of copyright law there is no difference. If I copy the CD for my *own* personal use so that I can store the master away for safe keeping, there is no problem. It sounds like a lot of symantics, but...
hope this helps answer that question. Trademark, trade dress and patents are other fun subjects
jim