REQUIREMENTS You must install a free program called Adobe Reader, version XI (11.0) or newer on your computer for editing the Digital Jewish Calendar. Download it for free at www.adobe.com.Easy-to-use PDF format works with Mac and PC.Need instructions? Get a Digital User Guide pdf hereThis Software is protected by copyright and other intellectual property laws. Kar-Ben Publishing owns the title, copyright, and other intellectual property rights in the Software. The Software is licensed, not sold. By purchasing a license, an individual or organization may use the software to create a calendar customized with dates and other information, and to share this customized calendar (as a pdf or printed) with others in an organization. You may not share or duplicate the Software. If there are multiple users creating multiple customized calendars, then additional licenses must be purchased for each user.