Study To Compare On-Demand Treatment To A Prophylaxis Regimen Of BeneFIX In Subjects With Moderately Severe to Severe Hemophilia B

Exclusion Criteria

• •Subjects who have received FIX as a primary or secondary prophylaxis regimen within the last 12 months prior to the Screening visit.
• •Subjects who have had major surgery or an orthopedic surgical procedure within the past 3 months prior to Screening visit.
• •Subjects for which major surgery or orthopedic surgery is planned within the duration of study participation.
• •Subjects with a past history of, or current FIX inhibitor, defined as \>ULN (upper limit of normal) of the reporting laboratory.
• •Subjects with a known hypersensitivity to any FIX product or hamster protein.