Searching multiple digital edition files

[_W_Wang_]

I have a series of ebooks in digital edition on the same set of topics, and I'd like to be able to search keywords across multiple ebooks. I don't seem to be able to find this capability in digital edition. Is something like this available? If not, is there any desktop search/indexing software that can help me do this?

[alawi_almogbel]

@ https://helpx.adobe.com/acrobat/using/searching-pdfs.html

There is a note stating:    If documents are encrypted (have security applied to them), you cannot search them as part of a multiple-document search. Open those documents first and search them one at a time. However, documents encrypted as Adobe Digital Editions are an exception and can be searched as part of a multiple-document search.

I am doing advance search however those PDFs encrypted as Adobe Digital Editions are not included as part of a multiple-document search. How can I include these?

The message is stating: "search has skipped 6 files because either these files are corrupt or you do not have permission to open them".