For help in digitally signing and securing your PDFs, an inexpensive solution called PDFSealer from ItekSoft Corp. will fit the bill.

The Windows-based PDFSealer lets users digitally sign PDFs with certificates. Users can also apply invisible signatures on PDFs by disabling showing signature appearance function.

In addition, users can create a self-signed certificate from the dialog button Create within the program. The digital signature can be verified by Acrobat reader or a compatible program, and users can apply signatures in batch for reviewing. You can also add or modify the PDFs' security with 40- or 128-bit password security.

PDFSealer is priced at $29 for a single-user license and can be purchased at the company's Web site here.

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