http://www.paulrapp.com/articles.php
I picked up this link some while ago, and it will be worth a read.
The main thing I came to the conclusion about with copyright is, even if the idea is available on the net is
'Do not make/copy the items for sale for personal gain without permission' Even if it is to raise funds for a charity it is better to check & ask for permission. And
DO put in the proper designer's name where possible -
DO NOT pass off other people's ideas as your own!
However if you just want to make one version for your personal use, that is usually not a problem., But it is still considerate to ask,
if it does not make it clear on the article you are reading. Magazine articles are put out there for people use their designs for
personal use only, and so too are a lot of the tutorials that are available in 'blogland'.
As for the internet - Not
everything is free, some people are using it as a shop front to sell their ideas/designs/patterns. They are trying to make money to pay their bills the same as you and me. Do you want to spend hours working on a pattern for sale, only for someone else to take credit and/or money for it?
It is positively awash with pirated design ideas, lots of people will come across an idea/picture that they like, take a copy of it, forget where it came from, put it on their blog to talk about it and so on and so on..... Some of the pictures are licenced and particularly museums suffer from loss of revenue because of the pirating.
And don't be surprised that the curators/designers are also computer savvy and will notice when their pictures are used elsewhere without permission on the web.
As for Disney not coming after a single person using their motifs for charity makes, think again. I don't recall any detail but I am sure that I have read stories to the contrary, and they come down on
anybody who infringes their 'rights' like a ton of bricks. As for other independant companies/designers, they probably won't come after you because they cannot afford to, because they lack the income due to theft!