If I am checking my articles using Copyscape or similar thing, what is an acceptable level of copying before it could be considered "too" lifted? Some of my articles show maybe 4% to 6% (meaning that 4% to 6% of my original article is found matching the text on another page), which does not seem like much. In a 500 word article, it would seem that some words will naturally occur in a sequence and surely does not mean (necessarily) that someone lifted your writing.
However, some of my original articles show up on the web anywhere from 30% to 96% identical wording. Is there an "accepted" standard? How much do you think would be too much?
Also, this works in reverse. If I research and write an article from what I've read, I don't want to be guilty of trying to get away with copying as much as I could get away with, but I also don't want to obsess over making sure there are no two words in sequence like someone else may have already written. Advice please.