Controls for operations on PDF files in Delphi

To create a new tool recently, you need to perform operations on PDF files, including file decryption, merging, adding bookmarks, and adding some simple text to PDF files. Of course, you must support Chinese characters. After searching on the network, there are many controls that support PDF file generation, but there are not so many controls that support file merging and modification. Finally, we found that there are two controls that meet the requirements: one is gnostice's development toolkit and the other is isedquickpdf. Both software provides the ability to operate PDF files, and both have the VCL version. An isedquickpdf control also provides the ability to generate PDF files, while gnostice's Development Toolkit does not provide the function of creating PDF files. To generate PDF files, you need to use another product of the company: edocengine. At the beginning, I chose isedquickpdf because I didn't want to use two controls in this tool. Soon, this tool was developed, and isedquickpdf is indeed a good tool. However, it seems that the isedquickpdf control has stopped updating, in addition, questions are not answered on the Forum of the website. Software Users create a website Repository. Looking back, gnostice seems to be still dynamic and constantly updating products. I regret it now. I chose a product that is about to die, and it will be difficult to maintain it in the future.
To learn from this issue, you must choose software in the future based on the update frequency and the corresponding speed of technical support. If you want to create a similar project in the future, you must select gnostice.