+eSellerate_DaysSince2000 eWeb_ValidateSerialNumber (\r
+ const char *serialNumber, /* "C" string */\r
+ const char *nameBasedKey, /* "C" string (nil if unneeded) */\r
+ const char *extraDataKey, /* "C" string (nil if unneeded) */\r
+ const char *publisherKey /* "C" string (nil if unneeded) */\r
+);\r
+/*\r
+ * return codes:\r
+ * if valid: date (days since January 1 2000) of expiration or (non-expiring) purchase\r
+ * if invalid: 0\r
+ */\r
+\r
+\r