Original sentence: Apple claims that they use the term as a genericized trademark and that the cost of certification would make the OS prohibitively expensive, although The Open Group has stated that there is a $110,000 USD upper limit on the cost of certification for one company.Furthermore, customers who purchase a Macintosh between the time a new version of Mac OS X is announced and the time it starts shipping preinstalled on new machines have typically been given upgrades at a much smaller cost ($9.95-19.95 USD).The reason for Apple not seeking "official" Unix branding may simply be that compliance is not a near- or medium-term goal for Apple.Though Mac OS X is "Unix-based" and features a BSD Unix compatibility layer, it is not compliant with the Single UNIX Specification
Edited sentence: Apple claims that they use the term as a genericized trademark and that the cost of certification would make the OS prohibitively expensive, although The Open Group has stated that there is a US$110,000 upper limit on the cost of certification for one company.Furthermore, customers who purchase a Macintosh between the time a new version of Mac OS X is announced and the time it starts shipping preinstalled on new machines have typically been given upgrades at a much smaller cost (US$9.95-19.95).Though Mac OS X is "Unix-based" and features a BSD Unix compatibility layer, it is not compliant with the Single UNIX Specification, and since compliance is not a near- or medium-term goal for Apple, this may be the overriding factor in not seeking "official" Unix branding