问是否有免费或开放源码软件来检查PDF/A的遵从性？

EN

Usage: veraPDF [options] FILES
  Options:
    -x, --extract
       Extracts and reports PDF features.
       Default: false
    --fixmetadata
       Performs metadata fixes.
       Default: false
    -f, --flavour
       Chooses built-in Validation Profile flavour, e.g. '1b'. Alternatively,
       supply '0' or no argument for automatic flavour detection based on a file
's
       metadata.
       Default: 0
       Possible Values: [0, 1a, 1b, 2a, 2b, 2u, 3a, 3b, 3u]
    --format
       Chooses output format.
       Default: mrr
       Possible Values: [xml, mrr, text]
    -h, --help
       Shows this message and exits.
       Default: false
    -l, --list
       Lists built-in Validation Profiles.
       Default: false
    --maxfailures
       Sets maximum amount of failed checks.
       Default: -1
    --maxfailuresdisplayed
       Sets maximum amount of failed checks displayed for each rule.
       Default: 100
    -o, --off
       Turns off PDF/A validation
       Default: false
    --policyfile
       Select a policy schematron or XSL file.
    --prefix
       Sets file name prefix for any fixed files.
       Default: veraFixMd_
    -p, --profile
       Loads a Validation Profile from given path and exits if loading fails.
       This overrides any choice or default implied by the -f / --flavour option
.
    -r, --recurse
       Recurses through directories. Only files with .pdf extensions are
       processed.
       Default: false
    --savefolder
       Sets output directory for any fixed files.
       Default: <empty string>
    --success, --passed
       Logs successful validation checks.
       Default: false
    -v, --verbose
       Adds failed test information to text output.
       Default: false
    --version
       Displays veraPDF version information.
       Default: false

veraPDF is processing STDIN and is expecting an EOF marker.
If this isn't your intention you can terminate by typing an EOF equivalent:
 - Linux or Mac users should type CTRL-D
 - Windows users should type CTRL-Z