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A difference in the number of copies of a gene an individual carries has recently been associated with predisposition to disease . In another effort to goose Vista sales in the early going , Microsoft also announced that customers will have six months to decide if they want to license up to two additional copies of Ultimate , the high-end version Vista , for $ 49.99 each . In cases where multiple copies of a given petition survive , they were microfilmed in normal chronological succession with no indication of duplicate identity . Ryder convinced Willard that they could have a profitable partnership selling Willlard 's work and he soon began selling photographic copies of Willard 's drawings . At the end of the 48-week study , there was essentially no difference in response between the two groups , with about 50 % of the participants having viral loads below 50 copies and an increase in CD4 + cell counts of about 200 . The typical stories you get back from India from packaged software vendors is they had to use pretty heavy encryption keys and copy protection to avoid employees taking copies outside the company , " he said . Again , the different copies of a version have frequently been retouched or corrected according to the original , and at various epochs some sort of recensions have been made . An important attribute of vac is that it writes each file as a separate collection of Venti blocks , thus ensuring that duplicate copies of a file will be coalesced on the server . Reserve books are normally not sent by mail , but copies of a chapter or other portions of the book can be mailed or faxed .