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The german original can be downloaded from here.
SetaPDF-Signer API - Features
The SetaPDF-Signer API allows PHP developers to write programms, which are able to digital sign PDF documents in pure PHP.
The API offers the following key features:
- Completely written in the interpreted PHP language
- Compatible with PDF documents up to version 1.7
- Digital sign PDF documents with any Certificate, that is useable with OpenSSL (CLI or PHP build in functions)
- Performance optimized
- Optional signature modules on request
- NEW: Visible signatures as of version 1.4
- NEW: RFC 3161 compatible timestamping as of version 1.5
- Easy to understand usage