Combine PDF files with digital signature fails

[GaloPDF 0]

After the update of Nitro Pro to version 11.0.7.411, in which several improvements are introduced in the digital signature of pdf files, the function of combining pdf files fails and gives constant origin to messages of error "file with restricted or limited access", especifically if they are files with digital signature, avoiding the addition of pdf files and therefore the final combination of them. If the previous version 11.0.6.326 is used, in which which displays a number of pages when combining documents, the program works correctly. I would appreciate contributions and solutions on this problem.