You cannot use Acrobat on a server, at all.
Thanks. Is there any other way we can do for checking on accessibility for PDF by programming? Do you have some advice? Thanks in advance
Any approach to check the accessibility of a given PDF file requires two types of checks:
- checks that can be carried out by software (e.g. is the language of the text indicated? is there Alt text for images? Are nested tags nested correctly? etc.)
- checks that can only be carried out by a human being (is an Alt entry actually meaningful? is the langauge for the text the correct language? Are the right tags used for the content? etc.)
For 1. you might find a tool you can license from the company xyMedia in Switzerland (cf. xyMedia), who have built a Matterhorn Protocol based validator "PDF Accessibility Checker PAC 2" for accessible PDF (as defined in the international standard for accessible PDF, ISO 1489-1 better known under its shorthand name PDF/UA); do not let the fact that their website is in German stop you from getting in touch, they do speak English.
For 2. you will have to figure out how to address this part. You could develop or license software that helps a user decide about the various aspect that require human judgment, to make the process easier and more productive.
In general, a good source for all thing PDF?UA and accessible PDF in general is the PDF Association website at PDF Association | The future of PDF. Here you can also find the Matterhorn Protocol (The Matterhorn Protocol 1.02 | PDF Association), a good starting point for any developer.