PDFlib PLOP Releases

Released: May 8, 2020

Updates in 5.4


  • Improvements for platforms and language bindings.
  • Updated third-party code to fix potential security vulnerabilities.
  • More workarounds for malformed PDF and XMP metadata.
  • Support for Alpine Linux.

Released: Sep 7, 2018

Updates in 5.3


  • Updated language bindings and platform support.
  • pCOS interface 12 with support for identifying upcoming ISO standards.
  • Added the pCOS command-line tool.
  • Improved PDF optimization.


  • Numerous minor improvements and bug fixes in all areas.

Released: May 24, 2016

Updates in V5.1


  • Certificate security: encrypt a document against a set of recipients which are identified by their digital certificate.
  • pCOS interface 11 for retrieving details of documents encrypted with certificate security.
  • Updated language bindings and platform support.


  • Various bug fixes and improvements in the language bindings and kernel.