# SignatureType Enum

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

- Product: Adobe PDF Library 21
- Language: .NET Framework
- Version: APDFL21.0.0PlusP1e
- HTML page: https://docs.datalogics.com/apdfl21/DotNetFramework/APDFL21.0.0PlusP1e/enum/SignatureType
- Version index: https://docs.datalogics.com/apdfl21/DotNetFramework/APDFL21.0.0PlusP1e/llms.txt

**Namespace:** `Datalogics::PDFL`

## Description

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

## Values

- `CMS = 0`: Digital signature based on the Cryptographic Message Syntax (CMS) standard. CMS-based digital signatures contain embedded timestamps, per the RFC3161 specification.
- `RFC3161 = 1`: Trusted timestamp based on the Time-Stamp Protocol (RFC3161).
- `PADES = 2`: PAdES baseline (B-T) digital signature based on the ETSI EN 319 142-1 European Standard.