So you're saying my Bob Marley autographed CD of Exodus is fake?! Well thats just great...It's the home printer made "Joe Markus" certification that is more of a red flag than any signature variance. Might as well bought if from a "private collector" on ebay who swears he ran in to JC at Baskin Robbins and happened to have a piece of basketball floor for him to sign. Good rule of thumb. If there is doubt or it seems fishy, it probably is. Truth is you don't have to worry about these guys too much. Pretty easy to spot the scam even as a novice. It's the real talented forgers on expensive items that most people worry about. I have seen multiple Bob Marley signed albums that look brand new for $350. If they were real they would go for thousands and the chances someone had like 5 in mint condition are nil. All it takes is one sucker though. That's what the people with the homemade paper certifications hope for. They are not master criminals. It's a numbers game.