Time to back up your ebook libraries. Step one: Download Calibre - https://calibre-ebook.com Step two: Install Alf's DRM removal tools for Kindle bought ebooks https://apprenticealf.wordpress.com. - Source: Hacker News / over 1 year ago

You can use Calibre for your kindle books. Here is a guide on the setting to use and here is how to deal with the dmr protection. Source: over 1 year ago

If you install the DeDRM plugin from Apprentice Alf, you can pull books from Adobe Digital Editions into Calibre (once they're checked out into ADE) and it strips the DRM off them as it imports. Then you can return the book from ADE and it checks back into the library. Source: over 1 year ago

This tool DRM Removal Tool for eBooks. The easiest way is to use the deDRM plugin for calibre. Source: over 1 year ago

Anyway, try looking around on Alf's blog and maybe you can try MobileRead. Those guys can get very technical. But they are also limited in how much info they can provide. Source: almost 2 years ago

The Xiph.org foundation maintains FLAC and they have a list of tools that might be helpful. Source: about 1 year ago

Lastly, ALAC hasn't been updated by apple since 2016. FLAC is actively maintained by xiph.org and saw its last update this past October. Source: over 1 year ago

Excessive licensing costs weren’t the only concern surrounding MQA though. MQA is touted as being DRM free, with audio streams able to be stored in the very popular, open source FLAC format. Only the lower resolution 16-bit audio is truly DRM free however. MQA’s authentication watermarking must be present in the file, and properly validated at playback, otherwise MQA decoders will refuse to unfold the audio to... Source: over 1 year ago

FLAC continues to be actively maintained and updated. Which, actually thanks for asking your question because in checking sources I noticed FLAC was just updated not two weeks ago. I thik the last time I updated my encoder libraries was after MP3 lost patent protection and dropped licensing a few years ago, so this is fortuitous timing! Anyways, FLAC continues to be meaningfully updated (homepage @ xiph and the... Source: over 1 year ago

There are lossless audio compression standards such as FLAC. Source: almost 3 years ago