the most recent and gross example i can give is in the following article: http://www.teleread.com/ebooks/games-workshop-self-publishing-author-battle-over-space-marines/
The short story is that the lawyers for who ever owns the Warhammer IP has pressed a suit against a self published science fiction writer for using the term "Space Marine" and from the looks of it the self published writer has already lost even before the legal proceedings are finished since most of the online book sellers have dropped his book as a result of large corporate lobbying. I find this to be absolutely ludicrous, that some one's creative efforts can be reduced to plagiarism based of the use of two words less than seven letters long. This is being done in the name of Intellectual Properties.
At the same time i know we can't just remove all notions of copy right and IP laws, but clearly based from events in the past decade, as they are now they do not protect inventors and independant developers as they were meant to. (don't bring up the "they are there so that those corporations don't loose money" to some one who uses an idea, asceticism or hardware that is similar to theirs. That's not theft, that's competition, and corporations have been using IP laws to kill competition in order to drive prices sky high)
so personally i was thinking today that notion of plagiarism or IP theft should be based on three things; wording, aesthetics and hardware. And in order for something to be theft of an intellectual property it most copy 2 out of 3 of the mentioned qualities.
For example. Apple would not be allowed to sue a fruit store for having a similar logo based on that the store was "copying" only one out of the three qualities of Apple's product line (the aesthetic), however would still be able to protect themselves from those stores in china which use the apple name (wording) and logo (ascetic).
Like wise the self published author could not be sued for IP theft only for the premise that he used the wording "Space Marine".
its not a perfect idea, but its a whole hell of alot better than letting the man with the most money win.