Think your words and ideas are being ripped off? I admit I was a bit taken aback to see my own words on the website of a certain well-known seminary. (No names; two guesses.) Sometimes misunderstandings occur; other times the thieving rats need to own up to their "borrowing." In particular, sermon plagarism is a problem that can be addressed technologically.
See James Archer's article, "Find Content Stealing Weasels with Copyscape."
which promotes the new (?) Copyscape service and gives a poignant example of what he found.
Put positively, it is a good way to see who quotes things one believes. Take this ministry with a detailed statement of faith that incorporates the Winchester Profession verbatim.
Of course, there's not the least bit of irony that Copyscape's interface is a dead ringer for Google.