Thanks for the tips on PDF tools. I also save org files on shared folders to sync among different machines. I use GnuPG via the epg package to encrypt all file

Thanks for the tips on PDF tools. I also save org files on shared folders to sync among different machines. I use GnuPG via the epg package to encrypt all files before saving to the shared folders. GnuPG has relatively good cross platform support that I can move the encrypted files between different platforms.