Collabora has been quite active in the field, e.g. they’re the prime developers of WINE’s current Wayland solution. So it makes sense for Valve to partner up with them.

The same as for a lot of other use cases ;)

Nothing, the licenses are for content providers and equipment manufacturers, obviously in the end you pay the license when purchasing the goods but the amount is small.

I think your workflow is not optimal. Are you using software like Radarr and Sonarr? They do the renaming for you and come with Kodi integration. Or is this not feasible?

yEnc isn’t a cipher, but rather an encoding for mapping binary to text, similar to base64 (but much more effective). So this denotes yEncc encoding.

The files you’re seeing are PAR2 files, which are used for repairing. They’re useless without the base file. The file in your example contains 32 recovery blocks. That means if your base file has 32 or less damaged blocks, this parity file can repair it.

Usually, you’d download all files belonging together in a single download and let your downloader do the rest. This is normally done by loading an NZB file that you either get from a Usenet search engine or an indexer.