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Verifying a pdf signature raises an error when accessing SignerInfo native #122

• Fix new field name generation if it already exists
• New certificates for testing
• PDF/A validator in python/jnius

#25 Support for OCSP

#105 Sign pdf with password may corrupt file

Pull #97 from Seneca Cunningham

• automatic numbering of the sigfield field
• more options for pdf widget with annotation

Add support for signing existing form fields, configured using 'signform' (#96) Add auto-incrementing sigfield, enabled with auto_sigfield (#95)

Impossible to sign some pdf files with password due to wrong packing format (#84)

Use sigflags within DocMDP for protecting PDFs.