Mission Viejo - July 14, 2004 activePDF, Inc., a leading provider of PDF conversion and development tools, and AuthentiDate, Inc., a subsidiary of AuthentiDate Holding Corp., the technical provider of the United States Postal Service Electronic Postmark (USPS EPM), announced today that the USPS EPM has been integrated to work with activePDF Toolkit. activePDF Toolkit is a scalable, programmable, COM object that allows dynamic creation and manipulation of PDF files. By enabling the USPS EPM service in its Toolkit, activePDF provides its growing list of 9,000 customers with an added level of trust and integrity for their electronic communications. activePDF Toolkit now provides the capability to apply the USPS EPM for time and date stamping, and to enable digital signing of PDF files. Backed by the integrity of the United States Postal Service, the USPS EPM can detect unauthorized document tampering. Application of the USPS EPM also automatically creates an electronic “fingerprint” as evidence of electronic file content, which is stored for a period of seven years in a third-party repository. During this seven-year time period the original electronically postmarked document can be verified to detect content tampering. As such, the USPS EPM serves as an invaluable non-repudiation tool.