# SignatureType Enum

> Enumeration to specify fields to display as part of signature appearance.

- Product: Adobe PDF Library 21
- Language: Java
- Version: APDFL21.0.0PlusP1f
- HTML page: https://docs.datalogics.com/apdfl21/Java/APDFL21.0.0PlusP1f/enum/SignatureType
- Version index: https://docs.datalogics.com/apdfl21/Java/APDFL21.0.0PlusP1f/llms.txt

**Namespace:** `com::datalogics::PDFL`

## Description

Enumeration to specify fields to display as part of signature appearance.

## Values

- `CMS`: Digital signature based on the Cryptographic Message Syntax (CMS) standard. CMS-based digital signatures contain embedded timestamps, per the RFC3161 specification.
- `PADES`: PAdES baseline (B-T) digital signature based on the ETSI EN 319 142-1 European Standard.
- `RFC_3161`: Trusted timestamp based on the Time-Stamp Protocol (RFC3161).