@Bhawana Namrani  To generate an editable PDF you can use the EForm Creation feature in Pega Infinity. You can upload your smart PDF form via the EForm Wizard select the class for the PDF and map the fields to properties from your case. However Pega does not inherently track changes made to a PDF after it's been generated and downloaded. You would need to implement a custom solution to track these changes such as having the user re upload the modified PDF and comparing it to the original version. Using Active X object from API is not mentioned as a method for generating editable PDFs in the provided context.

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Generate the Editable PDF where user can edit few fields in the generated PDF