[fxtentacle]

"are blu-ray players connected to the internet and auto-updated nowadays?"

Some blu-rays force you to update before you can watch them. Also, the key revocation lists can (I believe) be included in the blu-ray itself to make them work offline, too.

[BXlnt2EachOther]

yes, keys can be revoked [in offline players] by inserting a newer disc with a newer version of the "media key block." wikipedia suggests they're up to version 78 of that data.

https://en.wikipedia.org/wiki/Media_Key_Block