Okay, I'm not an attorney either.... But I did work in real estate for quite a few years, as well as other businesses that used legal agreements... and I stayed at a Holiday Inn last nite.
It was drummed into us that only the original signature and document could be expected to hold up in court, if it ever came to that. Often faxes were used in real estate transactions for speed and efficiency in back and forth negotiations. But all those documents needed to be re-signed later before the deal could close. A copy should only be used in court if necessary, and was far more open to challenge.
Oh, and we also only used blue pens.
I was talking with a friend last evening who has run into a problem with copied documents... in particular her birth certificate. She's trying to have shares of a mining stock that she inherited some years ago but just recently found out about transfered over to her. Her grandfather bought them when they were literally penny stocks and no one knew suspected were diamonds in Canada! At this point, she can't even find out how many shares of stock are involved (probably a lot, because her grandfather invested in a number of other penny stocks, too), because the company and courts won't accept her birth certificate due to it being a copy of a copy that's barely legible, and no original has been found so far.