I've downloaded movie which is in .ISO extension file. When I open it using Deamon Tools I can see three folsers: Any!,BDMV,CERTIFICATE.
Is it possible to place this movie on portable HDD to watch it on TV?
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BDMV is the actual video. It is a BluRay formatted video. As it is a .ISO file, I am GUESSING that it is still encrypted. What you need to do is find an information on transcoding the video to another format, such as http://forum.videohelp.com/threads/333774-Create-MKV-from-a-BDMV-folder
That will allow you to get the video into a more open format.
This answer is intentionally vague as to decryption since that is getting close to DMCA areas.