I would like to know if writting a book based strongly on another book is consider copyrighthing. Is mainly the same topics but it is re written in other words is this consider coprighting. or not.
I think you should first ask authorization from the original author or you could put yourself in legal troubles
You can take ideas but not articles from book. Everything should be in your won words and you would be fine. If characters are same or places your asking for problems. Same goes for exact ideas.
if i am writting a book on flash sites based on a book i read. It mainly shares the same ideas and concepts but i wrote it all in my own words.
It could well be seen as derivitive and therefore a breach of IPR if not also a clear breach of copyright which, if contested in court and found against you, would lead to you having to fork out a heafty amount in compensation to the original author.
If you're doing nothing but taking each idea in another book and rewording it, you'll likely run into copyright issues. If you don't have anything unique to say, you probably aren't ready to write a book. Instead, spend some time outlining your own ideas into a format suitable for a book, and then write in your own words. Covering similar concepts is inevitable, but if you aren't going beyond a particular competing title, you not only are stealing the basic compilation of those ideas, but you'll have nothing remotely unique to make it actually marketable.
Even if it is a great book, you can learn more by reading other books on the subject and doing some research. If you have experience in an area, you can use that to help you get a fresh approach. Try to have a different organizational structure, so it doesn't look like the other book, too. That will help it seem like a unique product with something new to offer.
I think there is a website that can help you a little i think its called copyscan or copysence.com eaither way this website from what i understand helps catch people who are plagerising. Now i know thats not your intention but maybe if you used some kind of software or website that tells you if you copied somthing it might help you rewrite your book untill it is more your own.
I believe that if a writer has to use Copyscape to check if they are plagiarizing, that is a problem!
It's definitely a problem. Remember... there's no actual legal percentage of a piece you can change to be "safe" and say you're not violating a copyright. If you're not writing your own material, you're not "writing" at all.