Thanks for the information, it's very helpful.
Yes, what we are using is quiet old. We are planing to upgrade it to the latest one.
Here are 2 questions about the upgrade, don't know whether it's a good place to ask here, but still hope to get some answers.
We use extract feature in PDFL7. For example, we use APIs like PDDocCreateWordFinder, PDWordFinderEnumWords.
1. How does such APIs' forward compatibility, do I need to change a lot to extract words by the same APIs in PDFL 11?
2. Are these legacy APIs enough to handle latest PDF format?
Do you have some links to share with me about PDFL upgrade informations?
Thanks!