If only names, dates, and places were taken/copied from the book there is no copyright infringement but if entire chunks of notes or photos or anything original was taken you may have a legal issue to pursue. Of course, another issue is whether they credited your book as the source...if they didn't you should at the very least ask to be credited as the source. Joan PS: You could also provide the person with any corrections. In a message dated 4/14/2012 5:21:31 P.M. Eastern Daylight Time, hmw2173@att.net writes: In 1989 I put together a hard back family genealogy book. Back then it cost, what to me was a fortune! I gave a copy to those who helped me with information on their family side. Many others wanted one. I assume those others wanted it given to them also! because very few were willing to come up with any money. I have recently found some of the information which I had printed in the book on Ancestor com and other places on line. So I wouldn't advise anyone to write a book, and expect to get any funds back for the expense. That far back, (1970 - 80) family history was found by travel, a lot of it on foot, to cemeteries, to court-house, out of state county records, and visiting the older generation. So, its disheartening to see information on line, and mistakes printed. --- hmwh