All purchases made by Signature Science, LLC are governed by the Conditions of Purchase in effect as of the date of purchase unless otherwise explicitly agreed to in writing by an authorized representative. All versions of the Conditions of Purchase are available below and are listed with the start and end date for their effective period.
| VERSIONS | Start Date | End Date | |
| Version 1 | March 21, 2001 | April 30, 2001 | Download |
| Version 2 | May 1, 2001 | May 31, 2001 | Download |
| Version 3 | June 1, 2001 | June 30, 2001 | Download |
| Version 4 | July 1, 2001 | March 31, 2002 | Download |
| Version 5 | April 1, 2002 | October 31, 2010 | Download |
| Version 6 | November 1, 2010 | May 31, 2013 | Download |
| Version 7 | June 1, 2013 | February 28, 2014 | Download |
| Version 8 | March 1, 2014 | February 28, 2015 | Download |
| Version 9 | March 1, 2015 | October 31, 2022 | Download |
| Version 10 | November 1, 2022 | May 31, 2023 | Download |
| Version 11 | June 1, 2023 | Current | Download |
