The short answer
The current free audio tools do not remove DRM or supply decryption keys. They can convert supported accessible audio, including ordinary unprotected WMA files.
File format and media protection are different
WMA describes an audio format family; DRM describes access controls that may be attached to a particular download. Two files with the same .wma extension may have very different playback requirements.
Renaming an extension, choosing MP3 or installing a file converter does not remove the protection. Being able to see a file in a folder also does not prove it can be decoded as ordinary audio.
Check the original provider and playback options
If a purchase or subscription download is protected, check the provider’s currently supported playback or unprotected-download options. A missing license, unavailable provider service or damaged file requires a different solution from a normal format conversion.
Do not expect CyberPower Audio Editing Lab or Free MP3 WMA OGG Converter to provide a DRM bypass. Use media only where you have the necessary rights and access.
Convert an ordinary unprotected WMA
When the source is accessible, add it to Free MP3 WMA OGG Converter and select a supported output. Follow the WMA-to-MP3 guide for the actual controls and output checks.
If you need waveform edits, open an accessible audio file in the editor and follow the editing guide. Keep a copy of your original file.