Not sure I understand what your question.
It is clearly wrong to steel someones trick or method before they have put it in print (or on DVD). However to use ideas that have been published is completely fine.
personnaly i think doing your own trick and being original is what being a magician is all about i would like to know what you think?
No, not in my view!! If we just did out own effects - even the most creative magician - would be heavely restricted.
Like Isaac Newton wrote to fellow scientist Robert Hooke "
If I have seen further it is by standing on the shoulders of giants".
Its the same with magic. Most of our "creations" we create by standing on the shoulders of giants. There are however a few contempora magicians who really seems to have created some very original magic. Dan Harlans magic with elastics was impossible to do before the elastic was invented by Thomas hancock in 1820. If any magic historians are reading this, what type of magic existed before Dan Harlan came along?
What was the first elastic trick? Anyway, I see no problem in doing magic as long as the effects either has been published, or they are your own invention. If you are doing your own variant of something you have seen, I think you strictly speaking need permission to perform the effect from the inventor. However I am sure there are difficult border cases.
Also sometimes its completely OK to be inspired by an effect you see performed! I perform for example a Haloween effect inspired by an effect I have seen Darren Brown do, however my presentation is different and ALL elements in Derrens routine have been published and so its not really his effect.