callas pdfToolbox uses Profiles, Checks, Fixups, Process Plans and Libraries. These can be briefly summarized as follows:

• Checks can be used to search PDF files for specific factors, and Fixups allow you to alter files in line with specific criteria.
• Profiles are designed to link Checks and Fixups together.
• Process plans can be used to ensure that multiple Profiles, Checks or Fixups run one after another in a controlled fashion.
• Finally, Libraries enable users to bring all pre-specified categories together into personalized collections for a better overview.